RFC 1566 - Mail Monitoring MIB - Defines a portion of the Management Information Base (MIB) for use with network management protocols, and extends the basic Network Services Monitoring MIB to allow monitoring of Message Transfer Agents (MTAs). www.ietf.org/rfc/rfc1566.txt
RFC 1869 - SMTP Service Extensions (ESMTP) - Defines a framework for extending the SMTP service by defining a means whereby a server can inform a client as to the service extensions it supports. www.ietf.org/rfc/rfc1869.txt
RFC 1893 - Enhanced Mail System Status Codes - Describes the Enhanced Mail System Status Codes, a set of status codes for reporting mail system errors and delivery status notifications. www.ietf.org/rfc/rfc1893.txt
RFC 2033 - Local Mail Transfer Protocol (LMTP) - Describes the Local Mail Transfer Protocol (LMTP), for transporting mail into a system where a mail receiver does not manage a queue. www.ietf.org/rfc/rfc2033.txt
RFC 2060 - Internet Message Access Protocol (IMAP) - Version 4 Rev 1 - 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. www.ietf.org/rfc/rfc2060.txt
RFC 947 - Mail Routing and the Domain System - Describes how mail systems on the Internet are expected to route messages based on information from the domain system. www.ietf.org/rfc/rfc0974.txt
RFC 1939 - Post Office Protocol (POP) - Version 3 - Describes the widely implemented Post Office Protocol (POP), which allows a client to retrieve mail that a server is holding for it. www.ietf.org/rfc/rfc1939.txt
RFC 821 - Simple Mail Transfer Protocol (SMTP) - Describes the widely implemented Simple Mail Transfer Protocol (SMTP) designed to transfer mail reliably and efficiently and relay mail across transport service environments. www.ietf.org/rfc/rfc0821.txt