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RFC 2821 - Simple Mail Transfer Protocol - http://tools.ietf.org/html/rfc2821
Describes the widely implemented Simple Mail Transfer Protocol (SMTP) designed to transfer mail reliably and efficiently and relay mail across transport service environments. Obsoletes RFC 821, 974, 1869. |
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RFC 1939 - Post Office Protocol (POP) - Version 3 - http://tools.ietf.org/html/rfc1939
Describes the widely implemented Post Office Protocol (POP), which allows a client to retrieve mail that a server is holding for it. |
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RFC 1893 - Enhanced Mail System Status Codes - http://tools.ietf.org/html/rfc1893
Describes the Enhanced Mail System Status Codes, a set of status codes for reporting mail system errors and delivery status notifications. |
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RFC 2060 - Internet Message Access Protocol (IMAP) - Version 4 Rev 1 - http://tools.ietf.org/html/rfc2060
Describes the Internet Message Access Protocol (IMAP), which allows a client to access and manipulate electronic mail messages on a server, and permits manipulation of remote message folders. |
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RFC 2033 - Local Mail Transfer Protocol (LMTP) - http://tools.ietf.org/html/rfc2033
Describes the Local Mail Transfer Protocol (LMTP), for transporting mail into a system where a mail receiver does not manage a queue. |