SmtpExtension Fields

AUTH extension. You can use SupportedAuthenticationMethods to obtain all authentication methods supported by the remote server.

BINARYMIME extension. (RFC 3030)

8BITMIME extension. (RFC 6152)

CHUNKING extension. Allows sending message in chunks, without SMTP's \r\n.->\r\n.. conversion, which improves memory usage. (RFC 3030)

DSN extension. It allows client to specify the conditions under which a Delivery Status Notification should be generated (Configuration, DeliveryNotification) (RFC 3461)

ENHANCEDSTATUSCODES extension. It allows server to augment its responses with the enhanced mail system status codes. Server that support this extension is going to provide EnhancedStatusCode in its responses. (RFC 2034, RFC 1893)

PIPELINING extension. It allows client to transmit groups of SMTP commands in batches without waiting for a response to each individual command. SendMessage(IMail) method uses this feature to speed up sending messages. (RFC 2920)

SIZE extension.

UTF8SMTP extension. Allows usage of UTF-8 email addresses (both local and domain part) without any encoding. Bit8Mime must be announced by the server when this extension is announced. BODY=8BITMIME or BODY=BINARYMIME must be used by the client if SMTPUTF8 extension is used. (RFC 6531)

STARTTLS is supported. You can use StartTLS to secure the connection.