MailMan C# Reference Documentation

MailMan

Current Version: 10.1.0
Requires Chilkat Bundle License

The Chilkat MailMan class is reponsible for sending email though SMTP and receiving/managing email on POP3 servers.

Object Creation

Chilkat.MailMan obj = new Chilkat.MailMan();

Properties

AbortCurrent
public bool AbortCurrent {get; set; }
Introduced in version 9.5.0.58

When set to true, causes the currently running method to abort. Methods that always finish quickly (i.e.have no length file operations or network communications) are not affected. If no method is running, then this property is automatically reset to false when the next method is called. When the abort occurs, this property is reset to false. Both synchronous and asynchronous method calls can be aborted. (A synchronous method call could be aborted by setting this property from a separate thread.)

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AllOrNone
public bool AllOrNone {get; set; }

Prevents sending any email if any of the addresses in the recipient list are rejected by the SMTP server. The default value is false, which indicates that the mail sending should continue even if some email addresses are invalid. (Note: Not all SMTP servers check the validity of email addresses, and even for those that do, it is not 100% accurate.)

Note: An SMTP server only knows the validity of email addresses within the domain it controls.

Important: The AllOrNone property only works if SMTP pipelining is turned off. By default, the SmtpPipelining property is turned on and has the value of true. If all-or-none behavior is desired, make sure to set SmtpPipelining equal to false.

More Information and Examples
AutoFix Explained in More Detail
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AutoFix
public bool AutoFix {get; set; }

If true, then the following will occur when a connection is made to an SMTP or POP3 server:

1) If the SmtpPort property = 465, then sets StartTLS = false and SmtpSsl = true
2) If the SmtpPort property = 25, sets SmtpSsl = false
3) If the MailPort property = 995, sets PopSsl = true
4) If the MailPort property = 110, sets PopSsl = false

The default value of this property is true.

More Information and Examples
AutoFix Explained in More Detail
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AutoGenMessageId
public bool AutoGenMessageId {get; set; }

Controls whether a unique Message-ID header is auto-generated for each email sent.

The Message-ID header field should contain a unique message ID for each email that is sent. The default behavior is to auto-generate this header field at the time the message is sent. This makes it easier for the same email object to be re-used. If the message ID is not unique, the SMTP server may consider the message to be a duplicate of one that has already been sent, and may discard it without sending. This property controls whether message IDs are automatically generated. If auto-generation is turned on (true), the value returned by GetHeaderField("Message-ID") will not reflect the actual message ID that gets sent with the email.

To turn off automatic Message-ID generation, set this property to false.

More Information and Examples
(.NET Core C#) Auto-Generate or Explicitly Specify the Message-ID Email Header(C#) Auto-Generate or Explicitly Specify the Message-ID Email Header(Mono C#) Auto-Generate or Explicitly Specify the Message-ID Email Header(PowerShell) Auto-Generate or Explicitly Specify the Message-ID Email Header
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AutoSmtpRset
public bool AutoSmtpRset {get; set; }

If true, then the SMTP "RSET" command is automatically sent to ensure that the SMTP connection is in a valid state when a new email is about to be sent on an already established connection. The default value is false.

Important: This property only applies when an email is sent on an already-open SMTP connection.

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AutoUnwrapSecurity
public bool AutoUnwrapSecurity {get; set; }
Introduced in version 9.5.0.49

If true, then digitally signed and/or encrypted email when downloaded from a mail server is automatically "unwrapped" and the results of the signature validation and decryption are available in various email object properties and methods. The default value of this property is true. Set this property to false to prevent unwrapping.

Note: A digitally signed or encrypted email can ONLY be verified and/or decrypted when initially loading the original MIME into the email object (i.e. when downloading from the server, or when loading from MIME). Once the MIME is parsed and stored in the internal email object format, the exactnes of the MIME has been lost and the signature can no longer be verified. This is why the signature is verified upon the intial loading of the MIME, and the results are made available through the various properties and methods. This property provides a means for downloading email where the .p7m (or .p7s) attachments are are to be treated as simple attachments and the desire is to access or save the original .p7m/.p7s files.

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ClientIpAddress
public string ClientIpAddress {get; set; }

The IP address to use for computers with multiple network interfaces or IP addresses. For computers with a single network interface (i.e. most computers), this property should not be set. For multihoming computers, the default IP address is automatically used if this property is not set.

The IP address is a string such as in dotted notation using numbers, not domain names, such as "165.164.55.124".

More Information and Examples
Important Bind to Adapter Notes for Windows
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ConnectFailReason
public int ConnectFailReason {get; }
Introduced in version 9.5.0.56

This property will be set to the status of the last connection made (or failed to be made) by any method.

Possible values are: 

0 = success

Normal (non-TLS) sockets:
1 = empty hostname
2 = DNS lookup failed
3 = DNS timeout
4 = Aborted by application.
5 = Internal failure.
6 = Connect Timed Out
7 = Connect Rejected (or failed for some other reason)

SSL/TLS:
100 = TLS internal error.
101 = Failed to send client hello.
102 = Unexpected handshake message.
103 = Failed to read server hello.
104 = No server certificate.
105 = Unexpected TLS protocol version.
106 = Server certificate verify failed (the server certificate is expired or the cert's signature verification failed).
107 = Unacceptable TLS protocol version.
109 = Failed to read handshake messages.
110 = Failed to send client certificate handshake message.
111 = Failed to send client key exchange handshake message.
112 = Client certificate's private key not accessible.
113 = Failed to send client cert verify handshake message.
114 = Failed to send change cipher spec handshake message.
115 = Failed to send finished handshake message.
116 = Server's Finished message is invalid.

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ConnectTimeout
public int ConnectTimeout {get; set; }

The time (in seconds) to wait before while trying to connect to a mail server (POP3 or SMTP). The default value is 30.

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DebugLogFilePath
public string DebugLogFilePath {get; set; }

If set to a file path, causes each Chilkat method or property call to automatically append it's LastErrorText to the specified log file. The information is appended such that if a hang or crash occurs, it is possible to see the context in which the problem occurred, as well as a history of all Chilkat calls up to the point of the problem. The VerboseLogging property can be set to provide more detailed information.

This property is typically used for debugging the rare cases where a Chilkat method call hangs or generates an exception that halts program execution (i.e. crashes). A hang or crash should generally never happen. The typical causes of a hang are:

  1. a timeout related property was set to 0 to explicitly indicate that an infinite timeout is desired,
  2. the hang is actually a hang within an event callback (i.e. it is a hang within the application code), or
  3. there is an internal problem (bug) in the Chilkat code that causes the hang.

More Information and Examples
(.NET Core C#) Example showing how to use DebugLogFilePath.(C#) Example showing how to use DebugLogFilePath.(Mono C#) Example showing how to use DebugLogFilePath.(PowerShell) Example showing how to use DebugLogFilePath.
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DsnEnvid
public string DsnEnvid {get; set; }

(An SMTP DSN service extension feature) An arbitrary string that will be used as the ENVID property when sending email. See RFC 3461 for more details.

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DsnNotify
public string DsnNotify {get; set; }

(An SMTP DSN service extension feature) A string that will be used as the NOTIFY parameter when sending email. (See RFC 3461 for more details. ) This string can be left blank, or can be set to "NEVER", or any combination of a comma-separated list of "SUCCESS", "FAILURE", or "NOTIFY".

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DsnRet
public string DsnRet {get; set; }

(An SMTP DSN service extension feature) A string that will be used as the RET parameter when sending email. (See RFC 3461 for more details. ) This string can be left blank, or can be set to "FULL" to receive entire-message DSN notifications, or "HDRS" to receive header-only DSN notifications.

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EmbedCertChain
public bool EmbedCertChain {get; set; }

If true, causes the digital certificate chain to be embedded in signed emails. The certificates in the chain of authentication are embedded up to but not including the root certificate. If the IncludeRootCert property is also true, then the root CA certificate is also included in the S/MIME signature.

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Filter
public string Filter {get; set; }

An expression that is applied to any of the following method calls when present: LoadXmlFile, LoadXmlString, LoadMbx, CopyMail, and TransferMail. For these methods, only the emails that match the filter's expression are returned in the email bundle. In the case of TransferMail, only the matching emails are removed from the mail server. The filter allows any header field, or the body, to be checked. 

Here are some examples of expressions:

Body like "mortgage rates*". 
Subject contains "update" and From contains "chilkat" 
To = "info@chilkatsoft.com" 

Here are the general rules for forming filter expressions:

Any MIME header field name can be used, case is insensitive. 
Literal strings are double-quoted, and case is insensitive. 
The "*" wildcard matches 0 or more occurrences of any character. 
Parentheses can be used to control precedence. 
The logical operators are: AND, OR, NOT (case insensitive) 
Comparison operators are: =, <, >, <=, >=, <> 
String comparison operators are: CONTAINS, LIKE (case insensitive)

Note: This property only works on text strings, not dates or numbers.

More Information and Examples
More information about the Filter property (for POP3)
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HeartbeatMs
public int HeartbeatMs {get; set; }

The time interval, in milliseconds, between AbortCheck event callbacks. The heartbeat provides a means for an application to monitor a mail-sending and/or mail-reading method call, and to abort it while in progress.

More Information and Examples
HeartbeatMs and the AbortCheck Event
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HeloHostname
public string HeloHostname {get; set; }

Specifies the hostname to be used for the EHLO/HELO command sent to an SMTP server. By default, this property is an empty string which causes the local hostname to be used.

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HttpProxyAuthMethod
public string HttpProxyAuthMethod {get; set; }

If an HTTP proxy requiring authentication is to be used, set this property to the HTTP proxy authentication method name. Valid choices are "Basic" or "NTLM".

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HttpProxyDomain
public string HttpProxyDomain {get; set; }

The NTLM authentication domain (optional) if NTLM authentication is used.

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HttpProxyHostname
public string HttpProxyHostname {get; set; }

If an HTTP proxy is to be used, set this property to the HTTP proxy hostname or IPv4 address (in dotted decimal notation).

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HttpProxyPassword
public string HttpProxyPassword {get; set; }

If an HTTP proxy requiring authentication is to be used, set this property to the HTTP proxy password.

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HttpProxyPort
public int HttpProxyPort {get; set; }

If an HTTP proxy is to be used, set this property to the HTTP proxy port number. (Two commonly used HTTP proxy ports are 8080 and 3128.)

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HttpProxyUsername
public string HttpProxyUsername {get; set; }

If an HTTP proxy requiring authentication is to be used, set this property to the HTTP proxy login name.

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ImmediateDelete
public bool ImmediateDelete {get; set; }

If true (the default) then any method that deletes an email from the POP3 server will also issue a QUIT command to close the session to ensure the message is deleted immediately.

The POP3 protocol is such that the DELE command marks a message for deletion. It is not actually deleted until the QUIT command is sent and the session is closed. If ImmediateDelete is true, then any Chilkat MailMan method that marks a message (or messages) for deletion will also followup with a QUIT command and close the session. If your program sets ImmediateDelete to false, it must make sure to call Pop3EndSession to ensure that messages marked for deletion are actually deleted.

More Information and Examples
POP3 Session Management
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IncludeRootCert
public bool IncludeRootCert {get; set; }

Controls whether the root certificate in the chain of authentication (i.e. the CA root certificate) is included within the S/MIME signature of a signed email. Note: This property only applies if the EmbedCertChain property is also true.

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IsPop3Connected
public bool IsPop3Connected {get; }
Introduced in version 9.5.0.48

Returns true if still connected to the POP3 server. Otherwise returns false.

Note: Accessing this property does not trigger any communication with the POP3 server. A connection to the POP3 server is established by explicitly calling Pop3BeginSession, or it is implicitly established as needed by any method that requires communication. A lost connection might only be detected when attempting to communicate with the server. To truly determine if a connection to the POP3 server is open and valid, it may be necessary to call the Pop3Noop method instead. This property might return true if the server has disconnected, but the client has not attempted to communicate with the server since the disconnect.

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IsSmtpConnected
public bool IsSmtpConnected {get; }

Returns true if still connected to the SMTP server. Otherwise returns false (if there was never a connection in the first place, or if the connection was lost).

Note: Accessing this property does not trigger any communication with the SMTP server. A connection to the SMTP server is established by explicitly calling OpenSmtpConnection, or it is implicitly established as needed by any method that requires communication. A lost connection might only be detected when attempting to communicate with the server. To truly determine if a connection to the SMTP server is open and valid, it may be necessary to call the SmtpNoop method instead. This property might return true if the server has disconnected, but the client has not attempted to communicate with the server since the disconnect.

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LastErrorHtml
public string LastErrorHtml {get; }

Provides information in HTML format about the last method/property called. If a method call returns a value indicating failure, or behaves unexpectedly, examine this property to get more information.

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LastErrorText
public string LastErrorText {get; }

Provides information in plain-text format about the last method/property called. If a method call returns a value indicating failure, or behaves unexpectedly, examine this property to get more information.

More Information and Examples
Concept of LastErrorTextLastErrorText Standard Information
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LastErrorXml
public string LastErrorXml {get; }

Provides information in XML format about the last method/property called. If a method call returns a value indicating failure, or behaves unexpectedly, examine this property to get more information.

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LastMethodSuccess
public bool LastMethodSuccess {get; set; }

Indicate whether the last method call succeeded or failed. A value of true indicates success, a value of false indicates failure. This property is automatically set for method calls. It is not modified by property accesses. The property is automatically set to indicate success for the following types of method calls:

  • Any method that returns a string.
  • Any method returning a Chilkat object, binary bytes, or a date/time.
  • Any method returning a standard boolean status value where success = true and failure = false.
  • Any method returning an integer where failure is defined by a return value less than zero.

Note: Methods that do not fit the above requirements will always set this property equal to true. For example, a method that returns no value (such as a "void" in C++) will technically always succeed.

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LastSmtpStatus
public int LastSmtpStatus {get; }

Returns the last SMTP diagnostic status code. This can be checked after sending an email. SMTP reply codes are defined by RFC 821 - Simple Mail Transfer Protocol.

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LastSmtpStatusMsg
public string LastSmtpStatusMsg {get; }
Introduced in version 9.5.0.85

Returns the last SMTP status message associated with the last SMTP status code received. This can be checked after sending an email.

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LogMailReceivedFilename
public string LogMailReceivedFilename {get; set; }

A log filename where the MailMan will log each message in the exact form it was received from a POP3 server. This property is provided for help in debugging.

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LogMailSentFilename
public string LogMailSentFilename {get; set; }

A log filename where the MailMan will log the exact message sent to the SMTP server. This property is helpful in debugging.

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MailHost
public string MailHost {get; set; }

The domain name of the POP3 server. Do not include "http://" in the domain name. This property may also be set to an IP address string, such as "168.144.70.227". Both IPv4 and IPv6 address formats are supported.

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MailPort
public int MailPort {get; set; }

The port number of the POP3 server. Only needs to be set if the POP3 server is running on a non-standard port. The default value is 110. (If SSL/TLS is used by setting the PopSsl property = true, then this property should probably be set to 995, which is the standard SSL/TLS port for POP3.)

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MaxCount
public int MaxCount {get; set; }

Limits the number of messages the MailMan will try to retrieve from the POP3 server in a single method call. If you are trying to read a large mailbox, you might set this to a value such as 100 to download 100 emails at a time.

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OAuth2AccessToken
public string OAuth2AccessToken {get; set; }
Introduced in version 9.5.0.44

The OAUTH2 access token if OAUTH2 authentication is to be used for the authentication. For GMail, the Chilkat HTTP class/object's G_SvcOauthAccessToken method can be called to obtain an OAUTH2 access token for a GMail service account.

Starting in v9.5.0.83, this property can be set to also do XOAUTH2 authentication for POP3 sessions (pop.gmail.com).

More Information and Examples
(.NET Core C#) Get GMail SMTP OAuth2 Access Token for Desktop App(C#) Get GMail SMTP OAuth2 Access Token for Desktop App(Mono C#) Get GMail SMTP OAuth2 Access Token for Desktop App(PowerShell) Get GMail SMTP OAuth2 Access Token for Desktop App(.NET Core C#) SMTP XOAUTH2 Authentication(C#) SMTP XOAUTH2 Authentication(Mono C#) SMTP XOAUTH2 Authentication(PowerShell) SMTP XOAUTH2 Authentication(.NET Core C#) POP3 GMail XOAUTH2 Authentication(C#) POP3 GMail XOAUTH2 Authentication(Mono C#) POP3 GMail XOAUTH2 Authentication(PowerShell) POP3 GMail XOAUTH2 Authentication(.NET Core C#) Get POP3 GMail OAuth2 Access Token for Desktop App(C#) Get POP3 GMail OAuth2 Access Token for Desktop App(Mono C#) Get POP3 GMail OAuth2 Access Token for Desktop App(PowerShell) Get POP3 GMail OAuth2 Access Token for Desktop App
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OpaqueSigning
public bool OpaqueSigning {get; set; }

When false, a signed email is generated as multipart/signed. For example: 

Content-Type: multipart/signed; charset=utf-8; boundary="------------010909020906040709090605";
 protocol="application/pkcs7-signature";
 micalg=sha256

When true, a signed email is generated as signed-data. For example:

Content-Type: application/pkcs7-mime; name="smime.p7m"; micalg=sha256;
 smime-type="signed-data"

A multipart/signed email is such that the signature is contained in a separate MIME body part and the original content of the email is not encapsulated within the signature. A signed-data email is such that it's non-multipart MIME (content type is "application/pkcs7-signature") and the original email is encapsulated within the signature. This is historically known as an opaque signature.

The default value is true.

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P7mEncryptAttachFilename
public string P7mEncryptAttachFilename {get; set; }
Introduced in version 9.5.0.30

The filename attribute to be used in the Content-Disposition header field when sending a PCKS7 encrypted email. The default value is "smime.p7m".

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P7mSigAttachFilename
public string P7mSigAttachFilename {get; set; }
Introduced in version 9.5.0.30

The filename attribute to be used in the Content-Disposition header field when sending a PCKS7 opaque signed email. The default value is "smime.p7m".

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P7sSigAttachFilename
public string P7sSigAttachFilename {get; set; }
Introduced in version 9.5.0.30

The filename attribute to be used in the Content-Disposition header field when sending a signed email with a detached PKCS7 signature. The default value is "smime.p7s".

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PercentDoneScale
public int PercentDoneScale {get; set; }
Introduced in version 9.5.0.49

This property is only valid in programming environment and languages that allow for event callbacks.

Sets the value to be defined as 100% complete for the purpose of PercentDone event callbacks. The defaut value of 100 means that at most 100 event PercentDone callbacks will occur in a method that (1) is event enabled and (2) is such that it is possible to measure progress as a percentage completed. This property may be set to larger numbers to get more fine-grained PercentDone callbacks. For example, setting this property equal to 1000 will provide callbacks with .1 percent granularity. For example, a value of 453 would indicate 45.3% competed. This property is clamped to a minimum value of 10, and a maximum value of 100000.

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Pop3SessionId
public int Pop3SessionId {get; }

0 if no POP3 session is active. Otherwise a positive integer that is incremented with each new POP3 session. It may be used to determine if a new POP3 session has been established.

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Pop3SessionLog
public string Pop3SessionLog {get; }

This string property accumulates the raw commands sent to the POP3 server, and the raw responses received from the POP3 server. This property is read-only, but it may be cleared by calling ClearPop3SessionLog.

More Information and Examples
(.NET Core C#) POP3 Session Log(C#) POP3 Session Log(Mono C#) POP3 Session Log(PowerShell) POP3 Session Log
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Pop3SPA
public bool Pop3SPA {get; set; }

Controls whether SPA authentication for POP3 is used or not. To use SPA authentication, set this property = true. No other programming changes are required. The default value is false.

Note: If SPA (i.e. NTLM) authentication does not succeed, set the Global.DefaultNtlmVersion property equal to 1 and then retry.

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Pop3SslServerCertVerified
public bool Pop3SslServerCertVerified {get; }

When connecting via SSL, this property is true if the POP3 server's SSL certificate was verified. Otherwise it is set to false.

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Pop3Stls
public bool Pop3Stls {get; set; }

If true, then an unencrypted connection (typically on port 110) is automatically converted to a secure TLS connection via the STLS command (see RFC 2595) when connecting. This should only be used with POP3 servers that are known to support the STLS capability. If this property is set to true, then the PopSsl property should be set to false. (The PopSsl property controls whether the connection is SSL/TLS from the beginning. Setting the Pop3Stls property = true indicates that the POP3 client will initially connect unencrypted and then convert to TLS.)

The default value of this property is false.

More Information and Examples
(.NET Core C#) POP3 STARTTLS(C#) POP3 STARTTLS(Mono C#) POP3 STARTTLS(PowerShell) POP3 STARTTLS
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Pop3StlsIfPossible
public bool Pop3StlsIfPossible {get; set; }
Introduced in version 9.5.0.92

If true, then an unencrypted connection (typically on port 110) is automatically converted to a secure TLS connection via the STLS command if the mail server supports the STLS command. If the mail server does not support STLS, then the connection will remain unencrypted.

The default value of this property is false.

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PopPassword
public string PopPassword {get; set; }

The POP3 password.

If the Pop3SPA property is set, the PopUsername and PopPassword properties may be set to the string "default" to cause the component to use the current logged-on credentials (of the calling process) for authentication.

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PopPasswordBase64
public string PopPasswordBase64 {get; set; }

Provides a way to specify the POP3 password from a Base64-encoded string.

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PopSsl
public bool PopSsl {get; set; }

Controls whether TLS/SSL is used when reading email from a POP3 server. Note: Check first to determine if your POP3 server can accept TLS/SSL connections. Also, be sure to set the MailPort property to the TLS/SSL POP3 port number, which is typically 995.

The default value of this property is false.

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PopUsername
public string PopUsername {get; set; }

The POP3 login name.

If the Pop3SPA property is set, the PopUsername and PopPassword properties may be set to the string "default" to cause the component to use the current logged-on credentials (of the calling process) for authentication.

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PreferIpv6
public bool PreferIpv6 {get; set; }

If true, then use IPv6 over IPv4 when both are supported for a particular domain. The default value of this property is false, which will choose IPv4 over IPv6.

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ReadTimeout
public int ReadTimeout {get; set; }

The maximum time to wait, in seconds, if the POP3 or SMTP server stops responding. The default value is 30 seconds.

More Information and Examples
SMTP Timeout Sending Large Emails
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RequireSslCertVerify
public bool RequireSslCertVerify {get; set; }

If true, then the mailman will verify the SMTP or POP3 server's SSL certificate when connecting. The certificate is expired, or if the cert's signature is invalid, the connection is not allowed. The default value of this property is false. (Obviously, this only applies to SSL/TLS connections.)

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ResetDateOnLoad
public bool ResetDateOnLoad {get; set; }

Controls whether the Date header field is reset to the current date/time when an email is loaded from LoadMbx, LoadEml, LoadMime, LoadXml, or LoadXmlString. The default is false (to not reset the date). To automatically reset the date, set this property equal to true.

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SendBufferSize
public int SendBufferSize {get; set; }

The buffer size to be used with the underlying TCP/IP socket for sending. The default value is 32767.

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SendIndividual
public bool SendIndividual {get; set; }

Determines how emails are sent to distribution lists. If true, emails are sent to each recipient in the list one at a time, with the "To"header field containing the email address of the recipient. If false, emails will contain in the "To"header field, and are sent to 100 BCC recipients at a time. As an example, if your distribution list contained 350 email addresses, 4 emails would be sent, the first 3 having 100 BCC recipients, and the last email with 50 BCC recipients.The default value of this property is true.

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SizeLimit
public int SizeLimit {get; set; }

The MailMan will not try to retrieve mail messages from a POP3 server that are greater than this size limit. The default value is 0 indicating no size limit. The SizeLimit is specified in number of bytes.

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SmtpAuthMethod
public string SmtpAuthMethod {get; set; }

This property should usually be left empty. The MailMan will by default choose the most secure login method available to prevent unencrypted username and passwords from being transmitted if possible. However, some SMTP servers may not advertise the acceptable authorization methods, and therefore it is not possible to automatically determine the best authorization method. To force a particular auth method, or to prevent any authorization from being used, set this property to one of the following values: "NONE", "LOGIN", "PLAIN", "CRAM-MD5", or "NTLM".

Note: If NTLM authentication does not succeed, set the Global.DefaultNtlmVersion property equal to 1 and then retry.

More Information and Examples
(.NET Core C#) Send Email without Authentication (no Login)(C#) Send Email without Authentication (no Login)(Mono C#) Send Email without Authentication (no Login)(PowerShell) Send Email without Authentication (no Login)(.NET Core C#) SMTP NTLM Authentication(C#) SMTP NTLM Authentication(Mono C#) SMTP NTLM Authentication(PowerShell) SMTP NTLM Authentication
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SmtpFailReason
public string SmtpFailReason {get; }
Introduced in version 9.5.0.48

A keyword that indicates the cause of failure (or success) for the last SMTP related method called. Possible values are:

  1. Success The method call was successful.
  2. Failed A general failure not covered by any of the other possible keywords.
  3. NoValidRecipients The SMTP server rejected all receipients.
  4. NoRecipients The app failed to provide any recipients (TO, CC, or BCC).
  5. SomeBadRecipients The AllOrNone property is true, and some recipients were rejected by the SMTP server.
  6. Aborted The application aborted the method.
  7. NoFrom The failed to provide a FROM address.
  8. FromFailure The SMTP replied with an error in response to the "MAIL FROM" command.
  9. NoCredentials The application did not provide the required credentials, such as username or password.
  10. AuthFailure The login (authentication) failed.
  11. DataFailure The SMTP replied with an error in response to the "DATA" command.
  12. NoSmtpHostname The application failed to provide an SMTP hostname or IP address.
  13. StartTlsFailed Failed to convert the TCP connection to TLS via STARTTLS.
  14. ConnectFailed Unable to establish a TCP or TLS connection to the SMTP server.
  15. GreetingError The SMTP server immediately responded with an error status in the intial greeting.
  16. ConnectionLost The connection to the SMTP server was lost at some point during the method call.
  17. Timeout A timeout occurred when reading or writing the socket connection.
  18. RenderFailed A failure occurred when rendering the email. (Rendering the email for sending includes tasks such as signing or encrypting.)
  19. NotUnlocked The UnlockComponent method was not previously called on at least one instance of the mailman object.
  20. InternalFailure An internal failure that should be reported to Chilkat support.

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SmtpHost
public string SmtpHost {get; set; }

The domain name of the SMTP server. Do not include "http://" in the domain name. This property may also be set to an IP address string, such as "168.144.70.227". Both IPv4 and IPv6 address formats are supported.

More Information and Examples
Sending Email without an SMTP Server
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SmtpLoginDomain
public string SmtpLoginDomain {get; set; }

The Windows domain for logging into the SMTP server. Use this only if your SMTP server requires NTLM authentication, which means your SMTP server uses Integrated Windows Authentication. If there is no domain, this can be left empty.

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SmtpPassword
public string SmtpPassword {get; set; }

The password for logging into the SMTP server. Use this only if your SMTP server requires authentication. Chilkat Email.NET supports the LOGIN, PLAIN, CRAM-MD5, and NTLM login methods, and it will automatically choose the most secure method available. Additional login methods will be available in the future.

If NTLM (Windows-Integrated) authentication is used, the SmtpUsername and SmtpPassword properties may be set to the string "default" to cause the component to use the current logged-on credentials (of the calling process) for authentication.

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SmtpPipelining
public bool SmtpPipelining {get; set; }
Introduced in version 9.5.0.49

Controls whether SMTP pipelining is automatically used when the SMTP server indicates support for it. The default is true. Setting this property equal to false will prevent the SMTP pipelining feature from being used.

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SmtpPort
public int SmtpPort {get; set; }

The port number of the SMTP server used to send email. Only needs to be set if the SMTP server is running on a non-standard port. The default value is 25. If SmtpSsl is set to true, this property should be set to 465. (TCP port 465 is reserved by common industry practice for secure SMTP communication using the SSL protocol.)

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SmtpSessionLog
public string SmtpSessionLog {get; }

This string property accumulates the raw commands sent to the SMTP server, and the raw responses received from the SMTP server. This property is read-only, but it may be cleared by calling ClearSmtpSessionLog.

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SmtpSsl
public bool SmtpSsl {get; set; }

When set to true, causes the mailman to connect to the SMTP server with implicit SSL/TLS.

More Information and Examples
(.NET Core C#) GMail SMTP port 465 (SSL)(C#) GMail SMTP port 465 (SSL)(Mono C#) GMail SMTP port 465 (SSL)(PowerShell) GMail SMTP port 465 (SSL)AutoFix Explained in More Detail
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SmtpSslServerCertVerified
public bool SmtpSslServerCertVerified {get; }

If using SSL, this property will be set to true if the SMTP server's SSL certificate was verified when establishing the connection. Otherwise it is set to false.

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SmtpUsername
public string SmtpUsername {get; set; }

The login for logging into the SMTP server. Use this only if your SMTP server requires authentication.

Note: In many cases, an SMTP server will not require authentication when sending to an email address local to it's domain. However, when sending email to an external domain, authentication is required (i.e. the SMTP server is being used as a relay).

If the SmtpAuthMethod property is set to "NTLM", the SmtpUsername and SmtpPassword properties may be set to the string "default" to use the current Windows logged-on user credentials.

smtp.office365.com: If SMTP authentication fails for your smtp.office365.com account, it may be that your account is configured to require MFA (multi-factor authentication). You may need to change settings to allow for legacy authentication (single-factor auth). See https://docs.microsoft.com/en-us/azure/active-directory/conditional-access/block-legacy-authentication Also, an app password may be required. See https://docs.microsoft.com/en-us/azure/active-directory/user-help/multi-factor-authentication-end-user-app-passwords

More Information and Examples
550 5.7.1 Unable to relay
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SocksHostname
public string SocksHostname {get; set; }

The SOCKS4/SOCKS5 hostname or IPv4 address (in dotted decimal notation). This property is only used if the SocksVersion property is set to 4 or 5).

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SocksPassword
public string SocksPassword {get; set; }

The SOCKS5 password (if required). The SOCKS4 protocol does not include the use of a password, so this does not apply to SOCKS4.

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SocksPort
public int SocksPort {get; set; }

The SOCKS4/SOCKS5 proxy port. The default value is 1080. This property only applies if a SOCKS proxy is used (if the SocksVersion property is set to 4 or 5).

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SocksUsername
public string SocksUsername {get; set; }

The SOCKS4/SOCKS5 proxy username. This property is only used if the SocksVersion property is set to 4 or 5).

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SocksVersion
public int SocksVersion {get; set; }

May be set to one of the following integer values:

0 - No SOCKS proxy is used. This is the default.
4 - Connect via a SOCKS4 proxy.
5 - Connect via a SOCKS5 proxy.

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SoRcvBuf
public int SoRcvBuf {get; set; }

Sets the receive buffer size socket option. Normally, this property should be left unchanged. The default value is 4194304.

This property can be increased if download performance seems slow. It is recommended to be a multiple of 4096.

More Information and Examples
More Information about TCP performance and Buffer Sizes
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SoSndBuf
public int SoSndBuf {get; set; }

Sets the send buffer size socket option. Normally, this property should be left unchanged. The default value is 262144.

This property can be increased if upload performance seems slow. It is recommended to be a multiple of 4096. Testing with sizes such as 512K and 1MB is reasonable.

More Information and Examples
More Information about TCP performance and Buffer Sizes
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SslAllowedCiphers
public string SslAllowedCiphers {get; set; }
Introduced in version 9.5.0.48

Provides a means for setting a list of ciphers that are allowed for SSL/TLS connections. The default (empty string) indicates that all implemented ciphers are possible. The TLS ciphers supported in Chilkat v9.5.0.55 and later are: 

TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256
TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305_SHA256
TLS_DHE_RSA_WITH_CHACHA20_POLY1305_SHA256
TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA
TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256
TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA
TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA384
TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384
TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384
TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA
TLS_DHE_RSA_WITH_AES_256_CBC_SHA256
TLS_DHE_RSA_WITH_AES_256_GCM_SHA384
TLS_DHE_RSA_WITH_AES_256_CBC_SHA
TLS_RSA_WITH_AES_256_CBC_SHA256
TLS_RSA_WITH_AES_256_GCM_SHA384
TLS_RSA_WITH_AES_256_CBC_SHA
TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256
TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256
TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA
TLS_DHE_RSA_WITH_AES_128_CBC_SHA256
TLS_DHE_RSA_WITH_AES_128_GCM_SHA256
TLS_DHE_RSA_WITH_AES_128_CBC_SHA
TLS_RSA_WITH_AES_128_CBC_SHA256
TLS_RSA_WITH_AES_128_GCM_SHA256
TLS_RSA_WITH_AES_128_CBC_SHA
TLS_ECDHE_RSA_WITH_3DES_EDE_CBC_SHA
TLS_DHE_RSA_WITH_3DES_EDE_CBC_SHA
TLS_RSA_WITH_3DES_EDE_CBC_SHA
TLS_ECDHE_RSA_WITH_RC4_128_SHA
TLS_RSA_WITH_RC4_128_SHA
TLS_RSA_WITH_RC4_128_MD5
TLS_DHE_RSA_WITH_DES_CBC_SHA
TLS_RSA_WITH_DES_CBC_SHA
To restrict SSL/TLS connections to one or more specific ciphers, set this property to a comma-separated list of ciphers such as "TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384, TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384". The order should be in terms of preference, with the preferred algorithms listed first. (Note that the client cannot specifically choose the algorithm is picked because it is the server that chooses. The client simply provides the server with a list from which to choose.)

The property can also disallow connections with servers having certificates with RSA keys less than a certain size. By default, server certificates having RSA keys of 512 bits or greater are allowed. Add the keyword "rsa1024" to disallow connections with servers having keys smaller than 1024 bits. Add the keyword "rsa2048" to disallow connections with servers having keys smaller than 2048 bits.

Note: Prior to Chilkat v9.5.0.55, it was not possible to explicitly list allowed cipher suites. The deprecated means for indicating allowed ciphers was both incomplete and unprecise. For example, the following keywords could be listed to allow matching ciphers: "aes256-cbc", "aes128-cbc", "3des-cbc", and "rc4". These keywords will still be recognized, but programs should be updated to explicitly list the allowed ciphers.

secure-renegotiation: Starting in Chilkat v9.5.0.55, the keyword "secure-renegotiation" may be added to require that all renegotions be done securely (as per RFC 5746).

best-practices: Starting in Chilkat v9.5.0.55, this property may be set to the single keyword "best-practices". This will allow ciphers based on the current best practices. As new versions of Chilkat are released, the best practices may change. Changes will be noted here. The current best practices are:

  • If the server uses an RSA key, it must be 1024 bits or greater.
  • All renegotations must be secure renegotiations.
  • All ciphers using RC4, DES, or 3DES are disallowed.

Example: The following string would restrict to 2 specific cipher suites, require RSA keys to be 1024 bits or greater, and require secure renegotiations: "TLS_DHE_RSA_WITH_AES_256_CBC_SHA256, TLS_RSA_WITH_AES_256_CBC_SHA, rsa1024, secure-renegotiation"

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SslProtocol
public string SslProtocol {get; set; }
Introduced in version 9.5.0.46

Selects the secure protocol to be used for secure (SSL/TLS) connections (for both SMTP and POP3). Possible values are:

default
TLS 1.3
TLS 1.2
TLS 1.1
TLS 1.0
SSL 3.0
TLS 1.3 or higher
TLS 1.2 or higher
TLS 1.1 or higher
TLS 1.0 or higher
The default value is "default" which will choose the, which allows for the protocol to be selected dynamically at runtime based on the requirements of the server. Choosing an exact protocol will cause the connection to fail unless that exact protocol is negotiated. It is better to choose "X or higher" than an exact protocol. The "default" is effectively "SSL 3.0 or higher".

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StartTLS
public bool StartTLS {get; set; }

When set to true, causes the mailman to issue a STARTTLS command to switch over to a secure SSL/TLS connection prior to authenticating and sending email. The default value is false.

Note: This property applies to SMTP, not to POP3.

More Information and Examples
(.NET Core C#) GMail SMTP port 587 (STARTTLS)(C#) GMail SMTP port 587 (STARTTLS)(Mono C#) GMail SMTP port 587 (STARTTLS)(PowerShell) GMail SMTP port 587 (STARTTLS)
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StartTLSifPossible
public bool StartTLSifPossible {get; set; }
Introduced in version 9.5.0.67

When set to true, causes the mailman to do STARTTLS (if possible and supported by the server) to convert to a secure SMTP SSL/TLS connection prior to authenticating and sending email. The default value is true.

Note: Setting the StartTLS property = true causes STARTTLS to always be used, even if the SMTP server does not support it. This property allows for a non-encrypted connection, whereas the StartTLS property disallows non-encrypted connections.

Note: This property applies to SMTP, not to POP3.

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TlsCipherSuite
public string TlsCipherSuite {get; }
Introduced in version 9.5.0.49

Contains the current or last negotiated TLS cipher suite. If no TLS connection has yet to be established, or if a connection as attempted and failed, then this will be empty. A sample cipher suite string looks like this: TLS_DHE_RSA_WITH_AES_256_CBC_SHA256.

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TlsPinSet
public string TlsPinSet {get; set; }
Introduced in version 9.5.0.55

Specifies a set of pins for Public Key Pinning for TLS connections. This property lists the expected SPKI fingerprints for the server certificates. If the server's certificate (sent during the TLS handshake) does not match any of the SPKI fingerprints, then the TLS handshake is aborted and the connection fails. The format of this string property is as follows: 

hash_algorithm, encoding, SPKI_fingerprint_1, SPKI_fingerprint_2, ...
For example, the following string specifies a single sha256 base64-encoded SPKI fingerprint: 
"sha256, base64, lKg1SIqyhPSK19tlPbjl8s02yChsVTDklQpkMCHvsTE="
This example specifies two SPKI fingerprints: 
"sha256, base64, 4t37LpnGmrMEAG8HEz9yIrnvJV2euVRwCLb9EH5WZyI=, 68b0G5iqMvWVWvUCjMuhLEyekM5729PadtnU5tdXZKs="
Any of the following hash algorithms are allowed:.sha1, sha256, sha384, sha512, md2, md5, haval, ripemd128, ripemd160,ripemd256, or ripemd320.

The following encodings are allowed: base64, hex, and any of the encodings indicated in the link below.

More Information and Examples
Encodings Supported by Chilkat
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TlsVersion
public string TlsVersion {get; }
Introduced in version 9.5.0.49

Contains the current or last negotiated TLS protocol version. If no TLS connection has yet to be established, or if a connection as attempted and failed, then this will be empty. Possible values are "SSL 3.0", "TLS 1.0", "TLS 1.1", "TLS 1.2", and "TLS 1.3".

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UncommonOptions
public string UncommonOptions {get; set; }
Introduced in version 9.5.0.80

This is a catch-all property to be used for uncommon needs. This property defaults to the empty string and should typically remain empty. Can be set to a list of the following comma separated keywords:

  • ProtectFromVpn - Introduced in v9.5.0.80. On Android systems, will bypass any VPN that may be installed or active.
  • SmtpLoginAnsi - Introduced in v9.5.0.97. If the SMTP login and/or password contains non-us-ascii chars, some SMTP servers expect the utf-8 encoding, whereas others expect ANSI. Historically, Chilkat passed the login/password using the ANSI encoding. Starting in v9.5.0.97, Chilkat switched to using the utf-8 encoding. This uncommon option can be used to revert back to the old behavior of sending the ANSI byte representation.

More Information and Examples
(.NET Core C#) SMTP Enable TLS 1.3(C#) SMTP Enable TLS 1.3(Mono C#) SMTP Enable TLS 1.3(PowerShell) SMTP Enable TLS 1.3
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UseApop
public bool UseApop {get; set; }

If true, will automatically use APOP authentication if the POP3 server supports it. The default value of this property is false.

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VerboseLogging
public bool VerboseLogging {get; set; }

If set to true, then the contents of LastErrorText (or LastErrorXml, or LastErrorHtml) may contain more verbose information. The default value is false. Verbose logging should only be used for debugging. The potentially large quantity of logged information may adversely affect peformance.

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Version
public string Version {get; }

Version of the component/library, such as "9.5.0.94"

More Information and Examples
(.NET Core C#) How to get the Chilkat version at runtime.(C#) How to get the Chilkat version at runtime.(Mono C#) How to get the Chilkat version at runtime.(PowerShell) How to get the Chilkat version at runtime.
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Methods

AddPfxSourceData
public bool AddPfxSourceData(byte[] pfxData, string password);

Adds a PFX to the object's internal list of sources to be searched for certificates and private keys when decrypting or when creating signed email for sending. Multiple PFX sources can be added by calling this method once for each. (On the Windows operating system, the registry-based certificate stores are also automatically searched, so it is commonly not required to explicitly add PFX sources.)

The pfxData contains the bytes of a PFX file (also known as PKCS12 or .p12).

Returns true for success, false for failure.

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AddPfxSourceFile
public bool AddPfxSourceFile(string pfxFilePath, string password);

Adds a PFX file to the object's internal list of sources to be searched for certificates and private keys when decrypting or when sending signed email. Multiple PFX files can be added by calling this method once for each. (On the Windows operating system, the registry-based certificate stores are also automatically searched, so it is commonly not required to explicitly add PFX sources.)

The pfxFilePath contains the bytes of a PFX file (also known as PKCS12 or .p12).

Returns true for success, false for failure.

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CheckMail
public int CheckMail();

Returns the number of emails available on the POP3 server. Returns -1 on error.

The VerifyPopConnection method can be called to verify basic TCP/IP connectivity with the POP3 server. The VerifyPopLogin method can be called to verify the POP3 login. The Verify* methods are intended to be called as a way of diagnosing the failure when a POP3 method returns an error status.

More Information and Examples
(.NET Core C#) Test HotMail POP3 (pop3.live.com or pop-mail.outlook.com)(C#) Test HotMail POP3 (pop3.live.com or pop-mail.outlook.com)(Mono C#) Test HotMail POP3 (pop3.live.com or pop-mail.outlook.com)(PowerShell) Test HotMail POP3 (pop3.live.com or pop-mail.outlook.com)
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CheckMailAsync (.NET Core C#) (C#) (Mono C#) (PowerShell)
public Task CheckMailAsync();

Creates an asynchronous task to call the CheckMail method with the arguments provided. (Async methods are available starting in Chilkat v9.5.0.52.)

Note: Async method event callbacks happen in the background thread. Accessing and updating UI elements existing in the main thread may require special considerations.

Returns null on failure

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ClearBadEmailAddresses
public void ClearBadEmailAddresses();

Clears the list of bad email addresses stored within the Mailman object. When an email-sending method is called, any email addresses rejected by the SMTP server will be cached within the Mailman object. These can be accessed by calling the GetBadEmailAddresses method. This method clears the Mailman's in-memory cache of bad addresses.

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ClearPop3SessionLog
public void ClearPop3SessionLog();

Clears the contents of the Pop3SessionLog property.

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ClearSmtpSessionLog
public void ClearSmtpSessionLog();

Clears the contents of the SmtpSessionLog property.

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CloseSmtpConnection
public bool CloseSmtpConnection();

The mailman object automatically opens an SMTP connection (if necessary) whenever an email-sending method is called. The connection is kept open until explicitly closed by this method. Calling this method is entirely optional. The SMTP connection is also automatically closed when the mailman object is destructed. Thus, if an application calls SendEmail 10 times to send 10 emails, the 1st call will open the SMTP connection, while the subsequent 9 will send over the existing connection (unless a property such as username, login, hostname, etc. is changed, which would force the connection to become closed and re-established with the next mail-sending method call).

Note: This method sends a QUIT command to the SMTP server prior to closing the connection.

Returns true for success, false for failure.

More Information and Examples
Minimizing SMTP Sessions
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CloseSmtpConnectionAsync (.NET Core C#) (C#) (Mono C#) (PowerShell)
public Task CloseSmtpConnectionAsync();

Creates an asynchronous task to call the CloseSmtpConnection method with the arguments provided. (Async methods are available starting in Chilkat v9.5.0.52.)

Note: Async method event callbacks happen in the background thread. Accessing and updating UI elements existing in the main thread may require special considerations.

Returns null on failure

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CopyMail
public EmailBundle CopyMail();

Copy the email from a POP3 server into a EmailBundle. This does not remove the email from the POP3 server.

Returns null on failure

More Information and Examples
(.NET Core C#) POP3 CopyMail Example(C#) POP3 CopyMail Example(Mono C#) POP3 CopyMail Example(PowerShell) POP3 CopyMail Example
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CopyMailAsync (.NET Core C#) (C#) (Mono C#) (PowerShell) (.NET Core C#) (C#) (Mono C#) (PowerShell)
public Task CopyMailAsync();

Creates an asynchronous task to call the CopyMail method with the arguments provided. (Async methods are available starting in Chilkat v9.5.0.52.)

Note: Async method event callbacks happen in the background thread. Accessing and updating UI elements existing in the main thread may require special considerations.

Returns null on failure

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DeleteBundle
public bool DeleteBundle(EmailBundle emailBundle);

Marks multiple emails on the POP3 server for deletion. (Each email in emailBundle that is also present on the server is marked for deletion.) To complete the deletion of the emails, a "QUIT" message must be sent and the POP3 session ended. This will happen automatically when the ImmediateDelete property equals true, which is the default. If ImmediateDelete equals false, then the Pop3EndSession method can be called to send the "QUIT" and end the session (i.e. disconnect.)

Note: When making multiple calls to a Delete* method, it's best to turn off ImmediateDelete, and then manually call Pop3EndSession to finalize the deletions.

Also, any method call requiring communication with the POP3 server will automatically re-establish a session based on the current property settings.

Returns true for success, false for failure.

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DeleteBundleAsync (.NET Core C#) (C#) (Mono C#) (PowerShell)
public Task DeleteBundleAsync(EmailBundle emailBundle);

Creates an asynchronous task to call the DeleteBundle method with the arguments provided. (Async methods are available starting in Chilkat v9.5.0.52.)

Note: Async method event callbacks happen in the background thread. Accessing and updating UI elements existing in the main thread may require special considerations.

Returns null on failure

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DeleteByMsgnum
public bool DeleteByMsgnum(int msgnum);

Marks an email for deletion by message number. WARNING: Be very careful if calling this method. Message numbers are specific to a POP3 session. If a maildrop has (for example) 10 messages, the message numbers will be 1, 2, 3, ... 10. If message number 1 is deleted and a new POP3 session is established, there will be 9 messages numbered 1, 2, 3, ... 9.

IMPORTANT: A POP3 must first be established by either calling Pop3BeginSession explicitly, or implicitly by calling some other method that automatically establishes the session. This method will not automatically establish a new POP3 session (because if it did, the message numbers would potentially be different than what the application expects).

This method only marks an email for deletion. It is not actually removed from the maildrop until the POP3 session is explicitly ended by calling Pop3EndSession.

Returns true for success, false for failure.

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DeleteByMsgnumAsync (.NET Core C#) (C#) (Mono C#) (PowerShell)
public Task DeleteByMsgnumAsync(int msgnum);

Creates an asynchronous task to call the DeleteByMsgnum method with the arguments provided. (Async methods are available starting in Chilkat v9.5.0.52.)

Note: Async method event callbacks happen in the background thread. Accessing and updating UI elements existing in the main thread may require special considerations.

Returns null on failure

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DeleteByUidl
public bool DeleteByUidl(string uidl);

Marks an email on the POP3 server for deletion. To complete the deletion of an email, a "QUIT" message must be sent and the POP3 session ended. This will happen automatically when the ImmediateDelete property equals true, which is the default. If ImmediateDelete equals false, then the Pop3EndSession method can be called to send the "QUIT" and end the session (i.e. disconnect.)

Note: When making multiple calls to a Delete* method, it's best to turn off ImmediateDelete, and then manually call Pop3EndSession to finalize the deletions.

Also, any method call requiring communication with the POP3 server will automatically re-establish a session based on the current property settings.

Returns true for success, false for failure.

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DeleteByUidlAsync (.NET Core C#) (C#) (Mono C#) (PowerShell)
public Task DeleteByUidlAsync(string uidl);

Creates an asynchronous task to call the DeleteByUidl method with the arguments provided. (Async methods are available starting in Chilkat v9.5.0.52.)

Note: Async method event callbacks happen in the background thread. Accessing and updating UI elements existing in the main thread may require special considerations.

Returns null on failure

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DeleteEmail
public bool DeleteEmail(Email email);

Marks an email on the POP3 server for deletion. To complete the deletion of an email, a "QUIT" message must be sent and the POP3 session ended. This will happen automatically when the ImmediateDelete property equals true, which is the default. If ImmediateDelete equals false, then the Pop3EndSession method can be called to send the "QUIT" and end the session (i.e. disconnect.)

Note: When making multiple calls to a Delete* method, it's best to turn off ImmediateDelete, and then manually call Pop3EndSession to finalize the deletions.

Also, any method call requiring communication with the POP3 server will automatically re-establish a session based on the current property settings.

Returns true for success, false for failure.

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DeleteEmailAsync (.NET Core C#) (C#) (Mono C#) (PowerShell)
public Task DeleteEmailAsync(Email email);

Creates an asynchronous task to call the DeleteEmail method with the arguments provided. (Async methods are available starting in Chilkat v9.5.0.52.)

Note: Async method event callbacks happen in the background thread. Accessing and updating UI elements existing in the main thread may require special considerations.

Returns null on failure

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DeleteMultiple
public bool DeleteMultiple(StringArray uidlArray);

Marks multiple emails on the POP3 server for deletion. (Any email on the server having a UIDL equal to a UIDL found in uidlArray is marked for deletion.) To complete the deletion of the emails, a "QUIT" message must be sent and the POP3 session ended. This will happen automatically when the ImmediateDelete property equals true, which is the default. If ImmediateDelete equals false, then the Pop3EndSession method can be called to send the "QUIT" and end the session (i.e. disconnect.)

Note: When making multiple calls to a Delete* method, it's best to turn off ImmediateDelete, and then manually call Pop3EndSession to finalize the deletions.

Also, any method call requiring communication with the POP3 server will automatically re-establish a session based on the current property settings.

Returns true for success, false for failure.

More Information and Examples
Using GMail? You'll need to read this information.
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DeleteMultipleAsync (.NET Core C#) (C#) (Mono C#) (PowerShell)
public Task DeleteMultipleAsync(StringArray uidlArray);

Creates an asynchronous task to call the DeleteMultiple method with the arguments provided. (Async methods are available starting in Chilkat v9.5.0.52.)

Note: Async method event callbacks happen in the background thread. Accessing and updating UI elements existing in the main thread may require special considerations.

Returns null on failure

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FetchByMsgnum
public Email FetchByMsgnum(int msgnum);

Fetches an email by message number. WARNING: Be very careful if calling this method. Message numbers are specific to a POP3 session. If a maildrop has (for example) 10 messages, the message numbers will be 1, 2, 3, ... 10. If message number 1 is deleted and a new POP3 session is established, there will be 9 messages numbered 1, 2, 3, ... 9.

IMPORTANT: A POP3 connection must first be established by either calling Pop3BeginSession explicitly, or implicitly by calling some other method that automatically establishes the session. This method will not automatically establish a new POP3 session (because if it did, the message numbers would potentially be different than what the application expects).

Returns null on failure

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FetchByMsgnumAsync (.NET Core C#) (C#) (Mono C#) (PowerShell) (.NET Core C#) (C#) (Mono C#) (PowerShell)
public Task FetchByMsgnumAsync(int msgnum);

Creates an asynchronous task to call the FetchByMsgnum method with the arguments provided. (Async methods are available starting in Chilkat v9.5.0.52.)

Note: Async method event callbacks happen in the background thread. Accessing and updating UI elements existing in the main thread may require special considerations.

Returns null on failure

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FetchEmail
public Email FetchEmail(string uidl);

Fetches an email from the POP3 mail server given its UIDL. Calling this method does not remove the email from the server. A typical program might get the email headers from the POP3 server by calling GetAllHeaders or GetHeaders, and then fetch individual emails by UIDL.

Returns a null reference on failure.

Returns null on failure

More Information and Examples
(.NET Core C#) POP3 Fetch a Single Email by UIDL(C#) POP3 Fetch a Single Email by UIDL(Mono C#) POP3 Fetch a Single Email by UIDL(PowerShell) POP3 Fetch a Single Email by UIDL
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FetchEmailAsync (.NET Core C#) (C#) (Mono C#) (PowerShell) (.NET Core C#) (C#) (Mono C#) (PowerShell)
public Task FetchEmailAsync(string uidl);

Creates an asynchronous task to call the FetchEmail method with the arguments provided. (Async methods are available starting in Chilkat v9.5.0.52.)

Note: Async method event callbacks happen in the background thread. Accessing and updating UI elements existing in the main thread may require special considerations.

Returns null on failure

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FetchMime
public byte[] FetchMime(string uidl);

Fetches an email by UIDL and returns the MIME source of the email in a byte array.

Returns an empty byte array on failure

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FetchMimeAsync (.NET Core C#) (C#) (Mono C#) (PowerShell)
public Task FetchMimeAsync(string uidl);

Creates an asynchronous task to call the FetchMime method with the arguments provided. (Async methods are available starting in Chilkat v9.5.0.52.)

Note: Async method event callbacks happen in the background thread. Accessing and updating UI elements existing in the main thread may require special considerations.

Returns null on failure

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FetchMimeBd
public bool FetchMimeBd(string uidl, BinData mimeData);
Introduced in version 9.5.0.73

Fetches an email by UIDL and returns the MIME source of the email in uidl.

Returns true for success, false for failure.

More Information and Examples
(.NET Core C#) POP3 Fetch Mime Source of Email by UIDL(C#) POP3 Fetch Mime Source of Email by UIDL(Mono C#) POP3 Fetch Mime Source of Email by UIDL(PowerShell) POP3 Fetch Mime Source of Email by UIDL
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FetchMimeBdAsync (.NET Core C#) (C#) (Mono C#) (PowerShell)
public Task FetchMimeBdAsync(string uidl, BinData mimeData);
Introduced in version 9.5.0.73

Creates an asynchronous task to call the FetchMimeBd method with the arguments provided. (Async methods are available starting in Chilkat v9.5.0.52.)

Note: Async method event callbacks happen in the background thread. Accessing and updating UI elements existing in the main thread may require special considerations.

Returns null on failure

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FetchMimeByMsgnum
public byte[] FetchMimeByMsgnum(int msgnum);

Fetches an email by message number and returns the MIME source of the email in a byte array. WARNING: Message sequend numbers are specific to a POP3 session. If a maildrop has (for example) 10 messages, the message numbers will be 1, 2, 3, ... 10. If message number 1 is deleted and a new POP3 session is established, there will be 9 messages numbered 1, 2, 3, ... 9.

IMPORTANT: A POP3 connection must first be established by either calling Pop3BeginSession explicitly, or implicitly by calling some other method that automatically establishes the session. This method will not automatically establish a new POP3 session (because if it did, the message numbers would potentially be different than what the application expects).

Returns an empty byte array on failure

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FetchMimeByMsgnumAsync (.NET Core C#) (C#) (Mono C#) (PowerShell)
public Task FetchMimeByMsgnumAsync(int msgnum);

Creates an asynchronous task to call the FetchMimeByMsgnum method with the arguments provided. (Async methods are available starting in Chilkat v9.5.0.52.)

Note: Async method event callbacks happen in the background thread. Accessing and updating UI elements existing in the main thread may require special considerations.

Returns null on failure

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FetchMultiple
public EmailBundle FetchMultiple(StringArray uidlArray);

Given an array of UIDL strings, fetchs all the emails from the POP3 server whose UIDL is present in the array, and returns the emails in a bundle.

Returns null on failure

More Information and Examples
(.NET Core C#) Process Large POP3 Mailbox(C#) Process Large POP3 Mailbox(Mono C#) Process Large POP3 Mailbox(PowerShell) Process Large POP3 Mailbox
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FetchMultipleAsync (.NET Core C#) (C#) (Mono C#) (PowerShell) (.NET Core C#) (C#) (Mono C#) (PowerShell)
public Task FetchMultipleAsync(StringArray uidlArray);

Creates an asynchronous task to call the FetchMultiple method with the arguments provided. (Async methods are available starting in Chilkat v9.5.0.52.)

Note: Async method event callbacks happen in the background thread. Accessing and updating UI elements existing in the main thread may require special considerations.

Returns null on failure

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FetchMultipleHeaders
public EmailBundle FetchMultipleHeaders(StringArray uidlArray, int numBodyLines);

Given an array of UIDL strings, fetchs all the email headers from the POP3 server whose UIDL is present in the array.

Note: The email objects returned in the bundle contain only headers. The attachments will be missing, and the bodies will be mostly missing (only the 1st numBodyLines lines of either the plain-text or HTML body will be present).

Returns null on failure

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FetchMultipleHeadersAsync (.NET Core C#) (C#) (Mono C#) (PowerShell) (.NET Core C#) (C#) (Mono C#) (PowerShell)
public Task FetchMultipleHeadersAsync(StringArray uidlArray, int numBodyLines);

Creates an asynchronous task to call the FetchMultipleHeaders method with the arguments provided. (Async methods are available starting in Chilkat v9.5.0.52.)

Note: Async method event callbacks happen in the background thread. Accessing and updating UI elements existing in the main thread may require special considerations.

Returns null on failure

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FetchMultipleMime
public StringArray FetchMultipleMime(StringArray uidlArray);

Given an array of UIDL strings, fetchs all the emails from the POP3 server whose UIDL is present in the array, and returns the MIME source of each email in an "stringarray" -- an object containing a collection of strings. Returns a null reference on failure.

Returns null on failure

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FetchMultipleMimeAsync (.NET Core C#) (C#) (Mono C#) (PowerShell) (.NET Core C#) (C#) (Mono C#) (PowerShell)
public Task FetchMultipleMimeAsync(StringArray uidlArray);

Creates an asynchronous task to call the FetchMultipleMime method with the arguments provided. (Async methods are available starting in Chilkat v9.5.0.52.)

Note: Async method event callbacks happen in the background thread. Accessing and updating UI elements existing in the main thread may require special considerations.

Returns null on failure

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FetchSingleHeader
public Email FetchSingleHeader(int numBodyLines, int messageNumber);

Fetches a single header by message number. Returns an email object on success, or a null reference on failure.

Note: The email objects returned in the bundle contain only headers. The attachments will be missing, and the bodies will be mostly missing (only the 1st messageNumber lines of either the plain-text or HTML body will be present).

Also Important:Message numbers are specific to a POP3 session (whereas UIDLs are valid across sessions). Be very careful when using this method.

Returns null on failure

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FetchSingleHeaderAsync (.NET Core C#) (C#) (Mono C#) (PowerShell) (.NET Core C#) (C#) (Mono C#) (PowerShell)
public Task FetchSingleHeaderAsync(int numBodyLines, int messageNumber);

Creates an asynchronous task to call the FetchSingleHeader method with the arguments provided. (Async methods are available starting in Chilkat v9.5.0.52.)

Note: Async method event callbacks happen in the background thread. Accessing and updating UI elements existing in the main thread may require special considerations.

Returns null on failure

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FetchSingleHeaderByUidl
public Email FetchSingleHeaderByUidl(int numBodyLines, string uidl);

Fetches a single header by UIDL. Returns an email object on success, or a null reference on failure.

Note: The email objects returned in the bundle contain only headers. The attachments will be missing, and the bodies will be mostly missing (only the 1st uidl lines of either the plain-text or HTML body will be present).

Returns null on failure

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FetchSingleHeaderByUidlAsync (.NET Core C#) (C#) (Mono C#) (PowerShell) (.NET Core C#) (C#) (Mono C#) (PowerShell)
public Task FetchSingleHeaderByUidlAsync(int numBodyLines, string uidl);

Creates an asynchronous task to call the FetchSingleHeaderByUidl method with the arguments provided. (Async methods are available starting in Chilkat v9.5.0.52.)

Note: Async method event callbacks happen in the background thread. Accessing and updating UI elements existing in the main thread may require special considerations.

Returns null on failure

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GetAllHeaders
public EmailBundle GetAllHeaders(int numBodyLines);

Returns all the emails from the POP3 server, but only the first numBodyLines lines of the body. Attachments are not returned. The emails returned in the bundle are valid email objects, the only difference is that the body is truncated to include only the top numBodyLines lines, and the attachments will be missing.

Returns null on failure

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GetAllHeadersAsync (.NET Core C#) (C#) (Mono C#) (PowerShell) (.NET Core C#) (C#) (Mono C#) (PowerShell)
public Task GetAllHeadersAsync(int numBodyLines);

Creates an asynchronous task to call the GetAllHeaders method with the arguments provided. (Async methods are available starting in Chilkat v9.5.0.52.)

Note: Async method event callbacks happen in the background thread. Accessing and updating UI elements existing in the main thread may require special considerations.

Returns null on failure

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GetBadEmailAddrs
public StringArray GetBadEmailAddrs();

Returns a string array object containing a list of failed and invalid email addresses that have accumulated during SMTP sends. The list will not contain duplicates. Also, this only works with some SMTP servers -- not all SMTP servers check the validity of each email address.

Note: An SMTP server can only validate the email addresses within it's own domain. External email address are not verifiable at the time of sending.

Returns null on failure

More Information and Examples
(.NET Core C#) MailMan GetBadEmailAddrs(C#) MailMan GetBadEmailAddrs(Mono C#) MailMan GetBadEmailAddrs(PowerShell) MailMan GetBadEmailAddrs
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GetFullEmail
public Email GetFullEmail(Email email);

If a partial email was obtained using GetHeaders or GetAllHeaders, this method will take the partial email as an argument, and download the full email from the server. A new email object (separate from the partial email) is returned. A null reference is returned on failure.

Returns null on failure

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GetFullEmailAsync (.NET Core C#) (C#) (Mono C#) (PowerShell) (.NET Core C#) (C#) (Mono C#) (PowerShell)
public Task GetFullEmailAsync(Email email);

Creates an asynchronous task to call the GetFullEmail method with the arguments provided. (Async methods are available starting in Chilkat v9.5.0.52.)

Note: Async method event callbacks happen in the background thread. Accessing and updating UI elements existing in the main thread may require special considerations.

Returns null on failure

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GetHeaders
public EmailBundle GetHeaders(int numBodyLines, int fromIndex, int toIndex);

The same as the GetAllHeaders method, except only the emails from fromIndex to toIndex on the POP3 server are returned. The first email on the server is at index 0.

Returns null on failure

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GetHeadersAsync (.NET Core C#) (C#) (Mono C#) (PowerShell) (.NET Core C#) (C#) (Mono C#) (PowerShell)
public Task GetHeadersAsync(int numBodyLines, int fromIndex, int toIndex);

Creates an asynchronous task to call the GetHeaders method with the arguments provided. (Async methods are available starting in Chilkat v9.5.0.52.)

Note: Async method event callbacks happen in the background thread. Accessing and updating UI elements existing in the main thread may require special considerations.

Returns null on failure

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GetMailboxCount
public int GetMailboxCount();

Returns the number of emails on the POP3 server, or -1 for failure.

This method is identical to CheckEmail. It was added for clarity.

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GetMailboxCountAsync (.NET Core C#) (C#) (Mono C#) (PowerShell)
public Task GetMailboxCountAsync();

Creates an asynchronous task to call the GetMailboxCount method with the arguments provided. (Async methods are available starting in Chilkat v9.5.0.52.)

Note: Async method event callbacks happen in the background thread. Accessing and updating UI elements existing in the main thread may require special considerations.

Returns null on failure

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GetMailboxInfoXml
public string GetMailboxInfoXml();

Returns an XML document with information about the emails in a POP3 mailbox. The XML contains the UIDL and size (in bytes) of each email in the mailbox.

Returns null on failure

More Information and Examples
(.NET Core C#) Example: Get POP3 Mailbox XML Summary(C#) Example: Get POP3 Mailbox XML Summary(Mono C#) Example: Get POP3 Mailbox XML Summary(PowerShell) Example: Get POP3 Mailbox XML Summary
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GetMailboxInfoXmlAsync (.NET Core C#) (C#) (Mono C#) (PowerShell)
public Task GetMailboxInfoXmlAsync();

Creates an asynchronous task to call the GetMailboxInfoXml method with the arguments provided. (Async methods are available starting in Chilkat v9.5.0.52.)

Note: Async method event callbacks happen in the background thread. Accessing and updating UI elements existing in the main thread may require special considerations.

Returns null on failure

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GetMailboxSize
public uint GetMailboxSize();

Returns the total combined size in bytes of all the emails in the POP3 mailbox. This is also known as the "mail drop" size. Returns -1 on failure.

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GetMailboxSizeAsync (.NET Core C#) (C#) (Mono C#) (PowerShell)
public Task GetMailboxSizeAsync();

Creates an asynchronous task to call the GetMailboxSize method with the arguments provided. (Async methods are available starting in Chilkat v9.5.0.52.)

Note: Async method event callbacks happen in the background thread. Accessing and updating UI elements existing in the main thread may require special considerations.

Returns null on failure

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GetPop3SslServerCert
public Cert GetPop3SslServerCert();

Returns the POP3 server's SSL certificate. This is available after connecting via SSL to a POP3 server. (To use POP3 SSL, set the PopSsl property = true.)

Returns a null reference if no POP3 SSL certificate is available.

Returns null on failure

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GetSentToEmailAddrs
public StringArray GetSentToEmailAddrs();

Returns the list of successful email addresses in the last call to a mail sending method, such as SendEmail.

When an email is sent, the email addresses that were flagged invalid by the SMTP server are saved in a "bad email addresses" list within the mailman object, and the acceptable email addresses are saved in a "good email addresses" list (within the mailman object). These internal lists are automatically reset at the start of the next mail-sending method call. This allows for a program to know which email addresses were accepted and which were not.

Note: The AllOrNone property controls whether the mail-sending method, such as SendEmail, returns false (to indicate failure) if any single email address is rejected.

Note: An SMTP server can only be aware of invalid email addresses that are of the same domain. For example, the comcast.net mail servers would only be aware of what comcast.net email addresses are valid. All external email addresses are implicitly accepted because the server is simply forwarding the email towards the mail server controlling that domain.

Returns null on failure

More Information and Examples
(.NET Core C#) MailMan GetSentToEmailAddrs(C#) MailMan GetSentToEmailAddrs(Mono C#) MailMan GetSentToEmailAddrs(PowerShell) MailMan GetSentToEmailAddrs
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GetSizeByUidl
public int GetSizeByUidl(string uidl);

Returns the size of an email (including attachments) given the UIDL of the email on the POP3 server. Returns -1 for failure.

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GetSizeByUidlAsync (.NET Core C#) (C#) (Mono C#) (PowerShell)
public Task GetSizeByUidlAsync(string uidl);

Creates an asynchronous task to call the GetSizeByUidl method with the arguments provided. (Async methods are available starting in Chilkat v9.5.0.52.)

Note: Async method event callbacks happen in the background thread. Accessing and updating UI elements existing in the main thread may require special considerations.

Returns null on failure

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GetSmtpSslServerCert
public Cert GetSmtpSslServerCert();

If using SSL/TLS, this method returns the SMTP server's digital certificate used with the secure connection.

Returns null on failure

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GetUidls
public StringArray GetUidls();

Returns the UIDLs of the emails currently stored on the POP3 server.

Returns null on failure

More Information and Examples
(.NET Core C#) Retrieve UIDL's from POP3 Server(C#) Retrieve UIDL's from POP3 Server(Mono C#) Retrieve UIDL's from POP3 Server(PowerShell) Retrieve UIDL's from POP3 Server
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GetUidlsAsync (.NET Core C#) (C#) (Mono C#) (PowerShell) (.NET Core C#) (C#) (Mono C#) (PowerShell)
public Task GetUidlsAsync();

Creates an asynchronous task to call the GetUidls method with the arguments provided. (Async methods are available starting in Chilkat v9.5.0.52.)

Note: Async method event callbacks happen in the background thread. Accessing and updating UI elements existing in the main thread may require special considerations.

Returns null on failure

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IsSmtpDsnCapable
public bool IsSmtpDsnCapable();

Contacts the SMTP server and determines if it supports the DSN (Delivery Status Notification) features specified by RFC 3461 and supported by the DsnEnvid, DsnNotify, and DsnRet properties. Returns true if the SMTP server supports DSN, otherwise returns false.

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IsSmtpDsnCapableAsync (.NET Core C#) (C#) (Mono C#) (PowerShell)
public Task IsSmtpDsnCapableAsync();

Creates an asynchronous task to call the IsSmtpDsnCapable method with the arguments provided. (Async methods are available starting in Chilkat v9.5.0.52.)

Note: Async method event callbacks happen in the background thread. Accessing and updating UI elements existing in the main thread may require special considerations.

Returns null on failure

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LastJsonData
public JsonObject LastJsonData();
Introduced in version 9.5.0.69

Provides information about what transpired in the last method called on this object instance. For many methods, there is no information. However, for some methods, details about what occurred can be obtained by getting the LastJsonData right after the method call returns.

Returns null on failure

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LoadEml
public Email LoadEml(string emlFilename);

Loads an email from a .eml file. (EML files contain the MIME source of an email.) Returns a null reference on failure.

Note: MHT files can be loaded into an email object by calling this method.

Returns null on failure

More Information and Examples
MHT = EML
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LoadMbx
public EmailBundle LoadMbx(string mbxFileName);

Loads a .mbx file containing emails and returns an email bundle. If a Filter is present, only emails matching the filter are returned.

Returns null on failure

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LoadMime
public Email LoadMime(string mimeText);

Creates and loads an email from a MIME string. Returns a null reference on failure.

Returns null on failure

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LoadTaskCaller
public bool LoadTaskCaller(Task task);
Introduced in version 9.5.0.80

Loads the caller of the task's async method.

Returns true for success, false for failure.

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LoadXmlEmail
public Email LoadXmlEmail(string filename);

Loads an XML file containing a single email and returns an email object. Returns a null reference on failure.

Returns null on failure

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LoadXmlEmailString
public Email LoadXmlEmailString(string xmlString);

Loads an XML string containing a single email and returns an email object. Returns a null reference on failure.

Returns null on failure

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LoadXmlFile
public EmailBundle LoadXmlFile(string filename);

Loads an XML file containing one or more emails and returns an email bundle. If a Filter is present, only emails matching the filter are returned. Returns a null reference on failure.

Returns null on failure

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LoadXmlString
public EmailBundle LoadXmlString(string xmlString);

Loads from an XML string containing emails and returns an email bundle. If a Filter is present, only emails matching the filter are returned.

Returns null on failure

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MxLookup
public string MxLookup(string emailAddress);

Performs a DNS MX lookup to return the mail server hostname based on an email address.

Returns null on failure

More Information and Examples
(.NET Core C#) MX Lookup Example(C#) MX Lookup Example(Mono C#) MX Lookup Example(PowerShell) MX Lookup Example
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MxLookupAll
public StringArray MxLookupAll(string emailAddress);

Performs a DNS MX lookup to return the list of mail server hostnames based on an email address. The primary server is at index 0. In most cases, there is only one mail server for a given email address.

Returns null on failure

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OpenSmtpConnection
public bool OpenSmtpConnection();

Explicitly opens a connection to the SMTP server and authenticates (if a username/password was specified). Calling this method is optional because the SendEmail method and other mail-sending methods will automatically open the connection to the SMTP server if one is not already established.

Note: This method is the equivalent of calling SmtpConnect followed by SmtpAuthenticate.

Returns true for success, false for failure.

More Information and Examples
Minimizing SMTP Connections(.NET Core C#) SMTP SSH Tunneling (Port Forwarding)(C#) SMTP SSH Tunneling (Port Forwarding)(Mono C#) SMTP SSH Tunneling (Port Forwarding)(PowerShell) SMTP SSH Tunneling (Port Forwarding)(.NET Core C#) Send Email with Hotmail (live.com) -- smtp-mail.outlook.com(C#) Send Email with Hotmail (live.com) -- smtp-mail.outlook.com(Mono C#) Send Email with Hotmail (live.com) -- smtp-mail.outlook.com(PowerShell) Send Email with Hotmail (live.com) -- smtp-mail.outlook.com
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OpenSmtpConnectionAsync (.NET Core C#) (C#) (Mono C#) (PowerShell)
public Task OpenSmtpConnectionAsync();

Creates an asynchronous task to call the OpenSmtpConnection method with the arguments provided. (Async methods are available starting in Chilkat v9.5.0.52.)

Note: Async method event callbacks happen in the background thread. Accessing and updating UI elements existing in the main thread may require special considerations.

Returns null on failure

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Pop3Authenticate
public bool Pop3Authenticate();
Introduced in version 9.5.0.56

Authenticates with the POP3 server using the property settings such as PopUsername, PopPassword, etc. This method should only be called after a successful call to Pop3Connect.

Note 1: The Pop3BeginSession method both connects and authenticates. It is the equivalent of calling Pop3Connect followed by Pop3Authenticate.

Note 2: All methods that communicate with the POP3 server, such as FetchEmail, will automatically connect and authenticate if not already connected and authenticated.

Returns true for success, false for failure.

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Pop3AuthenticateAsync (.NET Core C#) (C#) (Mono C#) (PowerShell)
public Task Pop3AuthenticateAsync();
Introduced in version 9.5.0.56

Creates an asynchronous task to call the Pop3Authenticate method with the arguments provided. (Async methods are available starting in Chilkat v9.5.0.52.)

Note: Async method event callbacks happen in the background thread. Accessing and updating UI elements existing in the main thread may require special considerations.

Returns null on failure

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Pop3BeginSession
public bool Pop3BeginSession();

Call to explicitly begin a POP3 session. It is not necessary to call this method because any method requiring an established POP3 session will automatically connect and login if a session is not already open.

Important: All TCP-based Internet communications, regardless of the protocol (such as HTTP, FTP, SSH, IMAP, POP3, SMTP, etc.), and regardless of SSL/TLS, begin with establishing a TCP connection to a remote host:port. External security-related infrastructure such as software firewalls (Windows Firewall), hardware firewalls, anti-virus, at either source or destination (or both) can block the connection. If the connection fails, make sure to check all potential external causes of blockage.

Returns true for success, false for failure.

More Information and Examples
More about POP3 Session Management
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Pop3BeginSessionAsync (.NET Core C#) (C#) (Mono C#) (PowerShell)
public Task Pop3BeginSessionAsync();

Creates an asynchronous task to call the Pop3BeginSession method with the arguments provided. (Async methods are available starting in Chilkat v9.5.0.52.)

Note: Async method event callbacks happen in the background thread. Accessing and updating UI elements existing in the main thread may require special considerations.

Returns null on failure

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Pop3Connect
public bool Pop3Connect();
Introduced in version 9.5.0.56

Explicitly establishes a connection to the POP3 server, which includes establishing a secure TLS channel if required, and receives the initial greeting. This method stops short of authenticating. The Pop3Authenticate method should be called after a successful call to this method.

When finished transacting with a POP3 mail server you can disconnect by calling Pop3EndSession or Pop3EndSessionNoQuit.

Note 1: The Pop3BeginSession method both connects and authenticates. It is the equivalent of calling Pop3Connect followed by Pop3Authenticate.

Note 2: All methods that communicate with the POP3 server, such as FetchEmail, will automatically connect and authenticate if not already connected and authenticated.

Important: All TCP-based Internet communications, regardless of the protocol (such as HTTP, FTP, SSH, IMAP, POP3, SMTP, etc.), and regardless of SSL/TLS, begin with establishing a TCP connection to a remote host:port. External security-related infrastructure such as software firewalls (Windows Firewall), hardware firewalls, anti-virus, at either source or destination (or both) can block the connection. If the connection fails, make sure to check all potential external causes of blockage.

Returns true for success, false for failure.

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Pop3ConnectAsync (.NET Core C#) (C#) (Mono C#) (PowerShell)
public Task Pop3ConnectAsync();
Introduced in version 9.5.0.56

Creates an asynchronous task to call the Pop3Connect method with the arguments provided. (Async methods are available starting in Chilkat v9.5.0.52.)

Note: Async method event callbacks happen in the background thread. Accessing and updating UI elements existing in the main thread may require special considerations.

Returns null on failure

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Pop3EndSession
public bool Pop3EndSession();

Call to explicitly end a POP3 session (sends the QUIT command and then closes the connection with the POP3 server). If the ImmediateDelete property is set to false, and emails marked for deletion will be deleted at this time.

Returns true for success, false for failure.

More Information and Examples
More about POP3 Session Management(.NET Core C#) Test HotMail POP3 (pop3.live.com or pop-mail.outlook.com)(C#) Test HotMail POP3 (pop3.live.com or pop-mail.outlook.com)(Mono C#) Test HotMail POP3 (pop3.live.com or pop-mail.outlook.com)(PowerShell) Test HotMail POP3 (pop3.live.com or pop-mail.outlook.com)
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Pop3EndSessionAsync (.NET Core C#) (C#) (Mono C#) (PowerShell)
public Task Pop3EndSessionAsync();

Creates an asynchronous task to call the Pop3EndSession method with the arguments provided. (Async methods are available starting in Chilkat v9.5.0.52.)

Note: Async method event callbacks happen in the background thread. Accessing and updating UI elements existing in the main thread may require special considerations.

Returns null on failure

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Pop3EndSessionNoQuit
public bool Pop3EndSessionNoQuit();

This method is identical to Pop3EndSession, but no "QUIT" command is sent. The client simply disconnects from the POP3 server.

This method should always return true.

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Pop3EndSessionNoQuitAsync (.NET Core C#) (C#) (Mono C#) (PowerShell)
public Task Pop3EndSessionNoQuitAsync();

Creates an asynchronous task to call the Pop3EndSessionNoQuit method with the arguments provided. (Async methods are available starting in Chilkat v9.5.0.52.)

Note: Async method event callbacks happen in the background thread. Accessing and updating UI elements existing in the main thread may require special considerations.

Returns null on failure

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Pop3Noop
public bool Pop3Noop();

Sends a NOOP command to the POP3 server. This may be a useful method to call periodically to keep a connection open, or to verify that the POP3 connection (session) is open and functioning.

Returns true for success, false for failure.

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Pop3NoopAsync (.NET Core C#) (C#) (Mono C#) (PowerShell)
public Task Pop3NoopAsync();

Creates an asynchronous task to call the Pop3Noop method with the arguments provided. (Async methods are available starting in Chilkat v9.5.0.52.)

Note: Async method event callbacks happen in the background thread. Accessing and updating UI elements existing in the main thread may require special considerations.

Returns null on failure

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Pop3Reset
public bool Pop3Reset();

Sends a RSET command to the POP3 server. If any messages have been marked as deleted by the POP3 server, they are unmarked. Calling Pop3Reset resets the POP3 session to a valid, known starting point.

Returns true for success, false for failure.

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Pop3ResetAsync (.NET Core C#) (C#) (Mono C#) (PowerShell)
public Task Pop3ResetAsync();

Creates an asynchronous task to call the Pop3Reset method with the arguments provided. (Async methods are available starting in Chilkat v9.5.0.52.)

Note: Async method event callbacks happen in the background thread. Accessing and updating UI elements existing in the main thread may require special considerations.

Returns null on failure

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Pop3SendRawCommand
public string Pop3SendRawCommand(string command, string charset);

Sends a raw command to the POP3 server and returns the POP3 server's response. If non-us-ascii characters are included in command, then charset indicates the charset to be used in sending the command (such as "utf-8", "ansi", "iso-8859-1", "Shift_JIS", etc.)

Returns null on failure

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Pop3SendRawCommandAsync (.NET Core C#) (C#) (Mono C#) (PowerShell)
public Task Pop3SendRawCommandAsync(string command, string charset);

Creates an asynchronous task to call the Pop3SendRawCommand method with the arguments provided. (Async methods are available starting in Chilkat v9.5.0.52.)

Note: Async method event callbacks happen in the background thread. Accessing and updating UI elements existing in the main thread may require special considerations.

Returns null on failure

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QuickSend
public bool QuickSend(string fromAddr, string toAddr, string subject, string body, string smtpServer);

A quick way to send an email to a single recipient without having to explicitly create an email object.

Returns true for success, false for failure.

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QuickSendAsync (.NET Core C#) (C#) (Mono C#) (PowerShell)
public Task QuickSendAsync(string fromAddr, string toAddr, string subject, string body, string smtpServer);

Creates an asynchronous task to call the QuickSend method with the arguments provided. (Async methods are available starting in Chilkat v9.5.0.52.)

Note: Async method event callbacks happen in the background thread. Accessing and updating UI elements existing in the main thread may require special considerations.

Returns null on failure

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RenderToMime
public string RenderToMime(Email email);

When an email is sent by calling SendEmail, it is first "rendered" according to the values of the email properties and contents. It may be digitally signed, encrypted, values substituted for replacement patterns, and header fields "Q"or "B" encoded as needed based on the email. The RenderToMime method performs the rendering, but without the actual sending. The MIME text produced is exactly what would be sent to the SMTP server had SendEmail been called. (The SendEmail method is effectively the same as calling RenderToMime followed by a call to SendMime.)

The rendered MIME string is returned on success.

Returns null on failure

More Information and Examples
(.NET Core C#) Using Replace Patterns in Email(C#) Using Replace Patterns in Email(Mono C#) Using Replace Patterns in Email(PowerShell) Using Replace Patterns in Email
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RenderToMimeBd
public bool RenderToMimeBd(Email email, BinData renderedMime);
Introduced in version 9.5.0.62

The same as RenderToMimeBytes, except the MIME is rendered into renderedMime. The rendered MIME is appended to renderedMime.

Returns true for success, false for failure.

More Information and Examples
(.NET Core C#) Send DKIM Signed Email(C#) Send DKIM Signed Email(Mono C#) Send DKIM Signed Email(PowerShell) Send DKIM Signed Email
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RenderToMimeBytes
public byte[] RenderToMimeBytes(Email email);

This method is the same as RenderToMime, but the MIME is returned in a byte array. If an email uses an 8bit or binary MIME encoding, then calling RenderToMime may introduce errors because it is not possible to return non-text binary data as a string. Therefore, calling RenderToMimeBytes is recommended over RenderToMime, unless it is assured that the email (MIME) does not use a binary encoding for non-text data.

Returns an empty byte array on failure

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RenderToMimeSb
public bool RenderToMimeSb(Email email, StringBuilder renderedMime);
Introduced in version 9.5.0.62

The same as RenderToMime, except the MIME is rendered into renderedMime. The rendered MIME is appended to renderedMime.

Returns true for success, false for failure.

More Information and Examples
(.NET Core C#) Sign Email using RSASSA-PSS with SHA256(C#) Sign Email using RSASSA-PSS with SHA256(Mono C#) Sign Email using RSASSA-PSS with SHA256(PowerShell) Sign Email using RSASSA-PSS with SHA256(.NET Core C#) Encrypt Email using RSAES-OAEP with AES-128 CBC and SHA256(C#) Encrypt Email using RSAES-OAEP with AES-128 CBC and SHA256(Mono C#) Encrypt Email using RSAES-OAEP with AES-128 CBC and SHA256(PowerShell) Encrypt Email using RSAES-OAEP with AES-128 CBC and SHA256
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SendBundle
public bool SendBundle(EmailBundle bundle);

Sends a bundle of emails. This is identical to calling SendEmail for each email in the bundle.

If an error occurs when sending one of the emails in the bundle, it will continue with each subsequent email until each email in the bundle has been attempted (unless a fatal error occurs, in which case the send is aborted).

Because it is difficult or impossible to programmatically identify which emails in the bundle failed and which succeeded, it is best to write a loop that sends each email separately (via the SendEmail method).

Returns true for success, false for failure.

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SendBundleAsync (.NET Core C#) (C#) (Mono C#) (PowerShell)
public Task SendBundleAsync(EmailBundle bundle);

Creates an asynchronous task to call the SendBundle method with the arguments provided. (Async methods are available starting in Chilkat v9.5.0.52.)

Note: Async method event callbacks happen in the background thread. Accessing and updating UI elements existing in the main thread may require special considerations.

Returns null on failure

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SendEmail
public bool SendEmail(Email email);

Sends a single email. The connection to the SMTP server will remain open so that a subsequent call to SendEmail (or other email-sending methods) can re-use the same connection. If any properties relating to the SMTP server are changed, such as SmtpHost, SmtpUsername, etc., then the next call to an email-sending method will automatically close the connection and re-establish a connection using the updated property settings.

Important: Some SMTP servers do not actually send the email until the connection is closed. In these cases, it is necessary to call CloseSmtpConnection for the mail to be sent. Most SMTP servers send the email immediately, and it is not required to close the connection.

GMail: If sending via smtp.gmail.com, then send with OAuth2 authentication if possible. Otherwise you will need to change your GMail account settings to allow for sending by less secure apps. See the links below.

Note: After sending email, information about what transpired is available via the LastJsonData method.

Note: Returns true if the final SMTP status code in the SMTP session is in the 200's or 300's. See SMTP Server Return Codes

Returns true for success, false for failure.

More Information and Examples
(.NET Core C#) Send Email(C#) Send Email(Mono C#) Send Email(PowerShell) Send Email(.NET Core C#) GMail SMTP Send using Previously Obtained OAuth2 Access Token(C#) GMail SMTP Send using Previously Obtained OAuth2 Access Token(Mono C#) GMail SMTP Send using Previously Obtained OAuth2 Access Token(PowerShell) GMail SMTP Send using Previously Obtained OAuth2 Access TokenConfigure GMail for less secure appsDiagnosing SMTP FailuresSocketError: WSAECONNABORTED when Sending Email (SMTP)SMTP 553-Relaying Denied550 5.7.1 Unable to relayUsing undisclosed recipients / Send FailedsockError: 10053, WSAECONNABORTED An established connection was aborted by the software in your host machineSending Email without a Mail Server (sort of)Invalid Token error when trying to connect with SSL (SMTP, POP3, IMAP, FTP, HTTP)SMTP SSL ClarificationRead Receipt vs. Delivery Receipt when Sending EmailC# SMTP Send in Background Thread with Progress Monitoring and AbortValidating an Email Address - Unfortunately, Nothing is PerfectPOP-before-SMTP Authentication(.NET Core C#) Send Email with Copy Placed in the Sent Folder(C#) Send Email with Copy Placed in the Sent Folder(Mono C#) Send Email with Copy Placed in the Sent Folder(PowerShell) Send Email with Copy Placed in the Sent Folder(.NET Core C#) Send Email Asynchronously using a Task(C#) Send Email Asynchronously using a Task(Mono C#) Send Email Asynchronously using a Task(PowerShell) Send Email Asynchronously using a Task
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SendEmailAsync (.NET Core C#) (C#) (Mono C#) (PowerShell)
public Task SendEmailAsync(Email email);

Creates an asynchronous task to call the SendEmail method with the arguments provided. (Async methods are available starting in Chilkat v9.5.0.52.)

Note: Async method event callbacks happen in the background thread. Accessing and updating UI elements existing in the main thread may require special considerations.

Returns null on failure

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SendMime
public bool SendMime(string fromAddr, string recipients, string mimeSource);

Provides complete control over the email that is sent. The MIME text passed in mimeSource (the MIME source of an email) is passed exactly as-is to the SMTP server. The recipients is a comma separated list of recipient email addresses. The fromAddr is the reverse-path email address. This is where bounced email (non-delivery reports) will be delivered. It may be different than the "From" header field in the mimeSource.

To understand how the fromAddr and recipients relate to the email addresses found in the MIME headers (FROM, TO, CC), see the link below entitled "SMTP Protocol in a Nutshell". The fromAddr is what is passed to the SMTP server in the "MAIL FROM" command. The recipients are the email addresses passed in "RCPT TO" commands. These are usually the same email addresses found in the MIME headers, but need not be (unless the SMTP server enforces policies that require them to be the same).

Note: Returns true if the final SMTP status code in the SMTP session is in the 200's or 300's. See SMTP Server Return Codes

Returns true for success, false for failure.

More Information and Examples
SMTP Protocol in a NutshellEmail send function returns success, but recipient never receives email?
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SendMimeAsync (.NET Core C#) (C#) (Mono C#) (PowerShell)
public Task SendMimeAsync(string fromAddr, string recipients, string mimeSource);

Creates an asynchronous task to call the SendMime method with the arguments provided. (Async methods are available starting in Chilkat v9.5.0.52.)

Note: Async method event callbacks happen in the background thread. Accessing and updating UI elements existing in the main thread may require special considerations.

Returns null on failure

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SendMimeBd
public bool SendMimeBd(string fromAddr, string recipients, BinData mimeData);
Introduced in version 9.5.0.73

This method is the same as SendMimeBytes, except the MIME is passed in an object (mimeData) rather than explicitly passing the bytes.

Note: Returns true if the final SMTP status code in the SMTP session is in the 200's or 300's. See SMTP Server Return Codes

Returns true for success, false for failure.

More Information and Examples
(.NET Core C#) Send DKIM Signed Email(C#) Send DKIM Signed Email(Mono C#) Send DKIM Signed Email(PowerShell) Send DKIM Signed Email(.NET Core C#) Send Email to Distribution List(C#) Send Email to Distribution List(Mono C#) Send Email to Distribution List(PowerShell) Send Email to Distribution List
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SendMimeBdAsync (.NET Core C#) (C#) (Mono C#) (PowerShell)
public Task SendMimeBdAsync(string fromAddr, string recipients, BinData mimeData);
Introduced in version 9.5.0.73

Creates an asynchronous task to call the SendMimeBd method with the arguments provided. (Async methods are available starting in Chilkat v9.5.0.52.)

Note: Async method event callbacks happen in the background thread. Accessing and updating UI elements existing in the main thread may require special considerations.

Returns null on failure

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SendMimeBytes
public bool SendMimeBytes(string fromAddr, string recipients, byte[] mimeSource);

This method is the same as SendMime, except the MIME is passed in a byte array. This can be important if the MIME uses a binary encoding, or if a DKIM/DomainKey signature is included.

To understand how the fromAddr and recipients relate to the email addresses found in the MIME headers (FROM, TO, CC), see the link below entitled "SMTP Protocol in a Nutshell". The fromAddr is what is passed to the SMTP server in the "MAIL FROM" command. The recipients are the email addresses passed in "RCPT TO" commands. These are usually the same email addresses found in the MIME headers, but need not be (unless the SMTP server enforces policies that require them to be the same).

Note: Returns true if the final SMTP status code in the SMTP session is in the 200's or 300's. See SMTP Server Return Codes

Returns true for success, false for failure.

More Information and Examples
SMTP Protocol in a NutshellEmail send function returns success, but recipient never receives email?
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SendMimeBytesAsync (.NET Core C#) (C#) (Mono C#) (PowerShell)
public Task SendMimeBytesAsync(string fromAddr, string recipients, byte[] mimeSource);

Creates an asynchronous task to call the SendMimeBytes method with the arguments provided. (Async methods are available starting in Chilkat v9.5.0.52.)

Note: Async method event callbacks happen in the background thread. Accessing and updating UI elements existing in the main thread may require special considerations.

Returns null on failure

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SendMimeToList
public bool SendMimeToList(string fromAddr, string distListFilename, string mimeSource);

Same as SendMime, but the recipient list is read from a text file (distListFilename) containing one email address per line.

Returns true for success, false for failure.

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SendMimeToListAsync (.NET Core C#) (C#) (Mono C#) (PowerShell)
public Task SendMimeToListAsync(string fromAddr, string distListFilename, string mimeSource);

Creates an asynchronous task to call the SendMimeToList method with the arguments provided. (Async methods are available starting in Chilkat v9.5.0.52.)

Note: Async method event callbacks happen in the background thread. Accessing and updating UI elements existing in the main thread may require special considerations.

Returns null on failure

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SetDecryptCert
public bool SetDecryptCert(Cert cert);
Introduced in version 9.5.0.40

Explicitly specifies the certificate to be used for decrypting encrypted email.

Returns true for success, false for failure.

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SetDecryptCert2
public bool SetDecryptCert2(Cert cert, PrivateKey privateKey);

Explicitly specifies the certificate and associated private key to be used for decrypting S/MIME encrypted email.

Note: In most cases, it is easier to call AddPfxSourceFile or AddPfxSourceData to provide the required cert and private key. On Windows systems where the certificate + private key has already been installed in the default certificate store, nothing needs to be done -- the mailman will automatically locate and use the required cert + private key.

Returns true for success, false for failure.

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SetPassword
public bool SetPassword(string protocol, SecureString password);
Introduced in version 9.5.0.71

Provides a more secure way of setting either the POP3 or SMTP password. The protocol can be "pop3" or "smtp". When the protocol is "pop3", this is equivalent to setting the PopPassword property. When protocol is "smtp", this is equivalent to setting the SmtpPassword property.

Returns true for success, false for failure.

More Information and Examples
(.NET Core C#) POP3 Login Secure(C#) POP3 Login Secure(Mono C#) POP3 Login Secure(PowerShell) POP3 Login Secure(.NET Core C#) SMTP Login Secure(C#) SMTP Login Secure(Mono C#) SMTP Login Secure(PowerShell) SMTP Login Secure
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SetSslClientCert
public bool SetSslClientCert(Cert cert);

Sets the client-side certificate to be used with SSL connections. This is typically not required, as most SSL connections are such that only the server is authenticated while the client remains unauthenticated.

Returns true for success, false for failure.

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SetSslClientCertPem
public bool SetSslClientCertPem(string pemDataOrFilename, string pemPassword);

Allows for a client-side certificate to be used for the SSL / TLS connection.

Returns true for success, false for failure.

More Information and Examples
How to Create a PEM that Contains Certificates and a Private Key
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SetSslClientCertPfx
public bool SetSslClientCertPfx(string pfxFilename, string pfxPassword);

Allows for a client-side certificate to be used for the SSL / TLS connection.

Returns true for success, false for failure.

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SmtpAuthenticate
public bool SmtpAuthenticate();
Introduced in version 9.5.0.48

Authenticates with the SMTP server using the property settings such as SmtpUsername, SmtpPassword, etc. This method should only be called after a successful call to SmtpConnect.

Note 1: The OpenSmtpConnection method both connects and authenticates. It is the equivalent of calling SmtpConnect followed by SmtpAuthenticate.

Note 2: All methods that communicate with the SMTP server, such as SendEmail, will automatically connect and authenticate if not already connected and authenticated.

Returns true for success, false for failure.

More Information and Examples
(.NET Core C#) GMail App Password(C#) GMail App Password(Mono C#) GMail App Password(PowerShell) GMail App Password
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SmtpAuthenticateAsync (.NET Core C#) (C#) (Mono C#) (PowerShell)
public Task SmtpAuthenticateAsync();
Introduced in version 9.5.0.48

Creates an asynchronous task to call the SmtpAuthenticate method with the arguments provided. (Async methods are available starting in Chilkat v9.5.0.52.)

Note: Async method event callbacks happen in the background thread. Accessing and updating UI elements existing in the main thread may require special considerations.

Returns null on failure

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SmtpConnect
public bool SmtpConnect();
Introduced in version 9.5.0.48

Explicitly establishes a connection to the SMTP server, which includes establishing a secure TLS channel if required, and receives the initial greeting. This method stops short of authenticating. The SmtpAuthenticate method should be called after a successful call to this method.

Note 1: The OpenSmtpConnection method both connects and authenticates. It is the equivalent of calling SmtpConnect followed by SmtpAuthenticate.

Note 2: All methods that communicate with the SMTP server, such as SendEmail, will automatically connect and authenticate if not already connected and authenticated.

Important: All TCP-based Internet communications, regardless of the protocol (such as HTTP, FTP, SSH, IMAP, POP3, SMTP, etc.), and regardless of SSL/TLS, begin with establishing a TCP connection to a remote host:port. External security-related infrastructure such as software firewalls (Windows Firewall), hardware firewalls, anti-virus, at either source or destination (or both) can block the connection. If the connection fails, make sure to check all potential external causes of blockage.

Returns true for success, false for failure.

More Information and Examples
(.NET Core C#) SMTP Connect and Authenticate(C#) SMTP Connect and Authenticate(Mono C#) SMTP Connect and Authenticate(PowerShell) SMTP Connect and Authenticate
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SmtpConnectAsync (.NET Core C#) (C#) (Mono C#) (PowerShell)
public Task SmtpConnectAsync();
Introduced in version 9.5.0.48

Creates an asynchronous task to call the SmtpConnect method with the arguments provided. (Async methods are available starting in Chilkat v9.5.0.52.)

Note: Async method event callbacks happen in the background thread. Accessing and updating UI elements existing in the main thread may require special considerations.

Returns null on failure

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SmtpNoop
public bool SmtpNoop();

Sends a no-op to the SMTP server. Calling this method is good for testing to see if the connection to the SMTP server is working and valid. The SmtpNoop method will automatically establish the SMTP connection if it does not already exist.

Returns true for success, false for failure.

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SmtpNoopAsync (.NET Core C#) (C#) (Mono C#) (PowerShell)
public Task SmtpNoopAsync();

Creates an asynchronous task to call the SmtpNoop method with the arguments provided. (Async methods are available starting in Chilkat v9.5.0.52.)

Note: Async method event callbacks happen in the background thread. Accessing and updating UI elements existing in the main thread may require special considerations.

Returns null on failure

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SmtpReset
public bool SmtpReset();

Sends an RSET command to the SMTP server. This method is rarely needed. The RSET command resets the state of the connection to the SMTP server to the initial state (so that the component can proceed with sending a new email). The SmtpReset method would only be needed if a mail-sending method failed and left the connection with the SMTP server open and in a non-initial state. (A situation that is probably not even possible with the Chilkat mail component.)

Returns true for success, false for failure.

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SmtpResetAsync (.NET Core C#) (C#) (Mono C#) (PowerShell)
public Task SmtpResetAsync();

Creates an asynchronous task to call the SmtpReset method with the arguments provided. (Async methods are available starting in Chilkat v9.5.0.52.)

Note: Async method event callbacks happen in the background thread. Accessing and updating UI elements existing in the main thread may require special considerations.

Returns null on failure

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SmtpSendRawCommand
public string SmtpSendRawCommand(string command, string charset, bool bEncodeBase64);

Sends a raw command to the SMTP server and returns the SMTP server's response. If non-us-ascii characters are included in command, then charset indicates the charset to be used in sending the command (such as "utf-8", "ansi", "iso-8859-1", "Shift_JIS", etc.)

If bEncodeBase64 is true, then the response is returned in Base64-encoded format. Otherwise the raw response is returned.

Returns null on failure

More Information and Examples
(.NET Core C#) SMTP Send Raw Command(C#) SMTP Send Raw Command(Mono C#) SMTP Send Raw Command(PowerShell) SMTP Send Raw Command
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SmtpSendRawCommandAsync (.NET Core C#) (C#) (Mono C#) (PowerShell)
public Task SmtpSendRawCommandAsync(string command, string charset, bool bEncodeBase64);

Creates an asynchronous task to call the SmtpSendRawCommand method with the arguments provided. (Async methods are available starting in Chilkat v9.5.0.52.)

Note: Async method event callbacks happen in the background thread. Accessing and updating UI elements existing in the main thread may require special considerations.

Returns null on failure

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SshAuthenticatePk
public bool SshAuthenticatePk(string sshLogin, SshKey sshUsername);

Authenticates with the SSH server using public-key authentication. The corresponding public key must have been installed on the SSH server for the sshLogin. Authentication will succeed if the matching sshUsername is provided.

Important: When reporting problems, please send the full contents of the LastErrorText property to support@chilkatsoft.com.

Returns true for success, false for failure.

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SshAuthenticatePkAsync (.NET Core C#) (C#) (Mono C#) (PowerShell)
public Task SshAuthenticatePkAsync(string sshLogin, SshKey sshUsername);

Creates an asynchronous task to call the SshAuthenticatePk method with the arguments provided. (Async methods are available starting in Chilkat v9.5.0.52.)

Note: Async method event callbacks happen in the background thread. Accessing and updating UI elements existing in the main thread may require special considerations.

Returns null on failure

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SshAuthenticatePw
public bool SshAuthenticatePw(string sshLogin, string sshPassword);

Authenticates with the SSH server using a sshLogin and sshPassword.

An SSH tunneling (port forwarding) session always begins by first calling SshTunnel to connect to the SSH server, then calling either AuthenticatePw or AuthenticatePk to authenticate.

Note: Once the SSH tunnel is setup by calling SshTunnel and SshAuthenticatePw (or SshAuthenticatePk), all underlying communcations with the POP3 or SMTP server use the SSH tunnel. No changes in programming are required other than making two initial calls to setup the tunnel.

Important: When reporting problems, please send the full contents of the LastErrorText property to support@chilkatsoft.com.

Returns true for success, false for failure.

More Information and Examples
(.NET Core C#) POP3 SSH Tunneling (Port Forwarding)(C#) POP3 SSH Tunneling (Port Forwarding)(Mono C#) POP3 SSH Tunneling (Port Forwarding)(PowerShell) POP3 SSH Tunneling (Port Forwarding)(.NET Core C#) SMTP SSH Tunneling (Port Forwarding)(C#) SMTP SSH Tunneling (Port Forwarding)(Mono C#) SMTP SSH Tunneling (Port Forwarding)(PowerShell) SMTP SSH Tunneling (Port Forwarding)
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SshAuthenticatePwAsync (.NET Core C#) (C#) (Mono C#) (PowerShell)
public Task SshAuthenticatePwAsync(string sshLogin, string sshPassword);

Creates an asynchronous task to call the SshAuthenticatePw method with the arguments provided. (Async methods are available starting in Chilkat v9.5.0.52.)

Note: Async method event callbacks happen in the background thread. Accessing and updating UI elements existing in the main thread may require special considerations.

Returns null on failure

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SshCloseTunnel
public bool SshCloseTunnel();

Closes the SSH tunnel for SMTP or POP3.

Returns true for success, false for failure.

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SshCloseTunnelAsync (.NET Core C#) (C#) (Mono C#) (PowerShell)
public Task SshCloseTunnelAsync();

Creates an asynchronous task to call the SshCloseTunnel method with the arguments provided. (Async methods are available starting in Chilkat v9.5.0.52.)

Note: Async method event callbacks happen in the background thread. Accessing and updating UI elements existing in the main thread may require special considerations.

Returns null on failure

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SshOpenTunnel
public bool SshOpenTunnel(string sshHostname, int sshPort);
Introduced in version 9.5.0.50

Connects to an SSH server and creates a tunnel for SMTP or POP3. The sshHostname is the hostname (or IP address) of the SSH server. The sshPort is typically 22, which is the standard SSH port number.

An SSH tunneling (port forwarding) session always begins by first calling SshTunnel to connect to the SSH server, followed by calling either SshAuthenticatePw or SshAuthenticatePk to authenticate.

Note: Once the SSH tunnel is setup by calling SshOpenTunnel and SshAuthenticatePw (or SshAuthenticatePk), all underlying communcations with the SMTP or POP3 server use the SSH tunnel. No changes in programming are required other than making two initial calls to setup the tunnel.

Important: All TCP-based Internet communications, regardless of the protocol (such as HTTP, FTP, SSH, IMAP, POP3, SMTP, etc.), and regardless of SSL/TLS, begin with establishing a TCP connection to a remote host:port. External security-related infrastructure such as software firewalls (Windows Firewall), hardware firewalls, anti-virus, at either source or destination (or both) can block the connection. If the connection fails, make sure to check all potential external causes of blockage.

Returns true for success, false for failure.

More Information and Examples
(.NET Core C#) POP3 SSH Tunneling (Port Forwarding)(C#) POP3 SSH Tunneling (Port Forwarding)(Mono C#) POP3 SSH Tunneling (Port Forwarding)(PowerShell) POP3 SSH Tunneling (Port Forwarding)(.NET Core C#) SMTP SSH Tunneling (Port Forwarding)(C#) SMTP SSH Tunneling (Port Forwarding)(Mono C#) SMTP SSH Tunneling (Port Forwarding)(PowerShell) SMTP SSH Tunneling (Port Forwarding)
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SshOpenTunnelAsync (.NET Core C#) (C#) (Mono C#) (PowerShell)
public Task SshOpenTunnelAsync(string sshHostname, int sshPort);
Introduced in version 9.5.0.50

Creates an asynchronous task to call the SshOpenTunnel method with the arguments provided. (Async methods are available starting in Chilkat v9.5.0.52.)

Note: Async method event callbacks happen in the background thread. Accessing and updating UI elements existing in the main thread may require special considerations.

Returns null on failure

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TransferMail
public EmailBundle TransferMail();

Downloads and removes all email from a POP3 server. A bundle containing the emails is returned. A null reference is returned on failure.

Returns null on failure

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TransferMailAsync (.NET Core C#) (C#) (Mono C#) (PowerShell) (.NET Core C#) (C#) (Mono C#) (PowerShell)
public Task TransferMailAsync();

Creates an asynchronous task to call the TransferMail method with the arguments provided. (Async methods are available starting in Chilkat v9.5.0.52.)

Note: Async method event callbacks happen in the background thread. Accessing and updating UI elements existing in the main thread may require special considerations.

Returns null on failure

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TransferMultipleMime
public StringArray TransferMultipleMime(StringArray uidlArray);

Same as FetchMultipleMime except that the downloaded emails are also deleted from the server. Returns a null reference on failure.

Returns null on failure

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TransferMultipleMimeAsync (.NET Core C#) (C#) (Mono C#) (PowerShell) (.NET Core C#) (C#) (Mono C#) (PowerShell)
public Task TransferMultipleMimeAsync(StringArray uidlArray);

Creates an asynchronous task to call the TransferMultipleMime method with the arguments provided. (Async methods are available starting in Chilkat v9.5.0.52.)

Note: Async method event callbacks happen in the background thread. Accessing and updating UI elements existing in the main thread may require special considerations.

Returns null on failure

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UseCertVault
public bool UseCertVault(XmlCertVault vault);
Introduced in version 9.5.0.40

Adds an XML certificate vault to the object's internal list of sources to be searched for certificates and private keys when encrypting/decrypting or signing/verifying. Unlike the AddPfxSourceData and AddPfxSourceFile methods, only a single XML certificate vault can be used. If UseCertVault is called multiple times, only the last certificate vault will be used, as each call to UseCertVault will replace the certificate vault provided in previous calls.

Returns true for success, false for failure.

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UseSsh
public bool UseSsh(Ssh ssh);
Introduced in version 9.5.0.55

Uses an existing SSH tunnel for the connections to the POP3 andSMTP servers. This method is identical to the UseSshTunnel method, except the SSH connection is obtained from an SSH object instead of a Socket object.

Uses an existing SSH tunnel. This is useful for sharing an existing SSH tunnel connection wth other objects. (SSH is a protocol where the tunnel contains many logical channels. SMTP and POP3 connections can exist simultaneously within a single SSH tunnel as SSH channels.)

Returns true for success, false for failure.

More Information and Examples
(.NET Core C#) SMTP over Multiple Hop SSH(C#) SMTP over Multiple Hop SSH(Mono C#) SMTP over Multiple Hop SSH(PowerShell) SMTP over Multiple Hop SSH(.NET Core C#) POP3 over Multiple Hop SSH(C#) POP3 over Multiple Hop SSH(Mono C#) POP3 over Multiple Hop SSH(PowerShell) POP3 over Multiple Hop SSH
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UseSshTunnel
public bool UseSshTunnel(Socket tunnel);
Introduced in version 9.5.0.50

Uses an existing SSH tunnel. This is useful for sharing an existing SSH tunnel connection wth other objects. (SSH is a protocol where the tunnel contains many logical channels. SMTP and POP3 connections can exist simultaneously within a single SSH tunnel as SSH channels.)

Returns true for success, false for failure.

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VerifyPopConnection
public bool VerifyPopConnection();

Return true if a TCP/IP connection can be established with the POP3 server, otherwise returns false.

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VerifyPopConnectionAsync (.NET Core C#) (C#) (Mono C#) (PowerShell)
public Task VerifyPopConnectionAsync();

Creates an asynchronous task to call the VerifyPopConnection method with the arguments provided. (Async methods are available starting in Chilkat v9.5.0.52.)

Note: Async method event callbacks happen in the background thread. Accessing and updating UI elements existing in the main thread may require special considerations.

Returns null on failure

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VerifyPopLogin
public bool VerifyPopLogin();

Return true if a TCP/IP connection and login is successful with the POP3 server. Otherwise return false.

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VerifyPopLoginAsync (.NET Core C#) (C#) (Mono C#) (PowerShell)
public Task VerifyPopLoginAsync();

Creates an asynchronous task to call the VerifyPopLogin method with the arguments provided. (Async methods are available starting in Chilkat v9.5.0.52.)

Note: Async method event callbacks happen in the background thread. Accessing and updating UI elements existing in the main thread may require special considerations.

Returns null on failure

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VerifyRecips
public bool VerifyRecips(Email email, StringArray badAddrs);

Initiates sending an email, but aborts just after passing all recipients (TO, CC, BCC) to the SMTP server. This allows your program to collect email addresses flagged as invalid by the SMTP server.

Important: Please read this blog post before using this method: http://www.cknotes.com/?p=249

Returns true for success, false for failure.

More Information and Examples
(.NET Core C#) Verify Email Recipients(C#) Verify Email Recipients(Mono C#) Verify Email Recipients(PowerShell) Verify Email Recipients
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VerifyRecipsAsync (.NET Core C#) (C#) (Mono C#) (PowerShell)
public Task VerifyRecipsAsync(Email email, StringArray badAddrs);

Creates an asynchronous task to call the VerifyRecips method with the arguments provided. (Async methods are available starting in Chilkat v9.5.0.52.)

Note: Async method event callbacks happen in the background thread. Accessing and updating UI elements existing in the main thread may require special considerations.

Returns null on failure

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VerifySmtpConnection
public bool VerifySmtpConnection();

Return true if a TCP/IP connection can be established with the SMTP server, otherwise returns false.

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VerifySmtpConnectionAsync (.NET Core C#) (C#) (Mono C#) (PowerShell)
public Task VerifySmtpConnectionAsync();

Creates an asynchronous task to call the VerifySmtpConnection method with the arguments provided. (Async methods are available starting in Chilkat v9.5.0.52.)

Note: Async method event callbacks happen in the background thread. Accessing and updating UI elements existing in the main thread may require special considerations.

Returns null on failure

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VerifySmtpLogin
public bool VerifySmtpLogin();

Return true if a TCP/IP connection and login is successful with the SMTP server. Otherwise returns false.

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VerifySmtpLoginAsync (.NET Core C#) (C#) (Mono C#) (PowerShell)
public Task VerifySmtpLoginAsync();

Creates an asynchronous task to call the VerifySmtpLogin method with the arguments provided. (Async methods are available starting in Chilkat v9.5.0.52.)

Note: Async method event callbacks happen in the background thread. Accessing and updating UI elements existing in the main thread may require special considerations.

Returns null on failure

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Events

AbortCheck
public event AbortCheckEventHandler OnAbortCheck;

Provides the opportunity for a method call to be aborted. The AbortCheck event is fired periodically based on the value of the HeartbeatMs property. If HeartbeatMs is 0, then no AbortCheck events will fire. As an example, to fire 5 AbortCheck events per second, set the HeartbeatMs property equal to 200.

Chilkat .NET Event Implementation

Args are passed using Chilkat.AbortCheckEventArgs

Event callback implementation:

private void mailman_OnAbortCheck(object sender, Chilkat.AbortCheckEventArgs args)
	{
	    // application code goes here.
	}

To add an event handler:

Chilkat.MailMan mailman = new Chilkat.MailMan();
mailman.OnAbortCheck += mailman_OnAbortCheck;

Chilkat Mono/.NET Core Event Implementation

Event callback implementation:

public void handleAbortCheck(out bool abort)
	{
	    // application code goes here.
	}

To add an event handler:

Chilkat.MailMan mailman = new Chilkat.MailMan();
// ...
Chilkat.MailMan.AbortCheck abortCheck = new Chilkat.MailMan.AbortCheck(handleAbortCheck);
mailman.setAbortCheckCb(abortCheck);
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EmailReceived
public event EmailReceivedEventHandler OnEmailReceived;

Called just after an email has been received. This is useful for methods that download more than one email.

Chilkat .NET Event Implementation

Args are passed using Chilkat.EmailEventArgs

Event callback implementation:

private void mailman_OnEmailReceived(object sender, Chilkat.EmailEventArgs args)
	{
	    // application code goes here.
	}

To add an event handler:

Chilkat.MailMan mailman = new Chilkat.MailMan();
mailman.OnEmailReceived += mailman_OnEmailReceived;

Chilkat Mono/.NET Core Event Implementation

Event callback implementation:

public void handleEmailReceived(string subject, string fromAddr, string fromName, string returnPath, string date, string uidl, int sizeInBytes)
	{
	    // application code goes here.
	}

To add an event handler:

Chilkat.MailMan mailman = new Chilkat.MailMan();
// ...
Chilkat.MailMan.EmailReceived emailReceived = new Chilkat.MailMan.EmailReceived(handleEmailReceived);
mailman.setEmailReceivedCb(emailReceived);
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PercentDone
public event PercentDoneEventHandler OnPercentDone;

Provides the percentage completed for any method that involves network communications or time-consuming processing (assuming it is a method where a percentage completion can be measured). This event is only fired when it is possible to know a percentage completion, and when it makes sense to express the operation as a percentage completed. The pctDone argument will have a value from 1 to 100. For operations (Chilkat method calls) that complete very quickly, the number of PercentDone callbacks will vary, but the final callback should have a value of 100. For long running operations, no more than one callback per percentage point will occur (for example: 1, 2, 3, ... 98, 99, 100).

The PercentDone callback counts as an AbortCheck event. For method calls that complete quickly such that PercentDone events fire, it may be that AbortCheck events don't fire because the opportunity to abort is already provided in the PercentDone callback. For time consuming operations, where the amount of time between PercentDone callbacks are long, AbortCheck callbacks may be used to allow for the operation to be aborted in a more responsive manner.

The abort output argument provides a means for aborting the operation. Setting it to true will cause the method to abort and return a failed status (or whatever return value indicates failure).

Chilkat .NET Event Implementation

Args are passed using Chilkat.PercentDoneEventArgs

Event callback implementation:

private void mailman_OnPercentDone(object sender, Chilkat.PercentDoneEventArgs args)
	{
	    // application code goes here.
	}

To add an event handler:

Chilkat.MailMan mailman = new Chilkat.MailMan();
mailman.OnPercentDone += mailman_OnPercentDone;

Chilkat Mono/.NET Core Event Implementation

Event callback implementation:

public void handlePercentDone(int pctDone, out bool abort)
	{
	    // application code goes here.
	}

To add an event handler:

Chilkat.MailMan mailman = new Chilkat.MailMan();
// ...
Chilkat.MailMan.PercentDone percentDone = new Chilkat.MailMan.PercentDone(handlePercentDone);
mailman.setPercentDoneCb(percentDone);
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ProgressInfo
public event ProgressInfoEventHandler OnProgressInfo;

A general name/value event that provides information about what is happening during a method call. To find out what information is available, write code to handle this event and log the name/value pairs. Most are self-explanatory.

Chilkat .NET Event Implementation

Args are passed using Chilkat.ProgressInfoEventArgs

Event callback implementation:

private void mailman_OnProgressInfo(object sender, Chilkat.ProgressInfoEventArgs args)
	{
	    // application code goes here.
	}

To add an event handler:

Chilkat.MailMan mailman = new Chilkat.MailMan();
mailman.OnProgressInfo += mailman_OnProgressInfo;

Chilkat Mono/.NET Core Event Implementation

Event callback implementation:

public void handleProgressInfo(string name, string value)
	{
	    // application code goes here.
	}

To add an event handler:

Chilkat.MailMan mailman = new Chilkat.MailMan();
// ...
Chilkat.MailMan.ProgressInfo progressInfo = new Chilkat.MailMan.ProgressInfo(handleProgressInfo);
mailman.setProgressInfoCb(progressInfo);
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TaskCompleted
public event TaskCompletedEventHandler OnTaskCompleted;

Called in the background thread when an asynchronous task completes.

More Information and Examples
C# .NET Framework TaskCompleted Event Callback ExampleC# .NET Core TaskCompleted Event Callback Example

Chilkat .NET Event Implementation

Args are passed using Chilkat.TaskCompletedEventArgs

Event callback implementation:

private void mailman_OnTaskCompleted(object sender, Chilkat.TaskCompletedEventArgs args)
	{
	    // application code goes here.
	}

To add an event handler:

Chilkat.MailMan mailman = new Chilkat.MailMan();
mailman.OnTaskCompleted += mailman_OnTaskCompleted;

Chilkat Mono/.NET Core Event Implementation

Event callback implementation:

public void handleTaskIdCompleted(int taskId)
	{
	    // application code goes here.
	}

To add an event handler:

Chilkat.MailMan mailman = new Chilkat.MailMan();
// ...
Chilkat.MailMan.TaskIdCompleted taskIdCompleted = new Chilkat.MailMan.TaskIdCompleted(handleTaskIdCompleted);
mailman.setTaskIdCompletedCb(taskIdCompleted);
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