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IETF RFC: Simple Mail Transfer Protocol

Date added 26 November 2008
Last edited 10 November 2009

Full Title

IETF RFC: Simple Mail Transfer Protocol


IETF RFC: Simple Mail Transfer Protocol is a push protocol which ensures reliable and efficient transfer of e-mail through relay across multiple networks. Assuming a reliable ordered data stream channel, relay is independent of a particular transmission subsystem.

Standards Developing Organisation



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Lifecycle Actions

Access, Use and Reuse
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Standard Framework

Electronic Records Management Standards

Standard Type

Internet Protocols

Current Version

Further Information

Alternative Current Versions


Previous Versions

Referenced Standards

ANSI X3.4-1968, USA Code for Information Interchange
IANA: 2007, Address Literal Tags
IANA: 2007, Mail Parameters
IETF RFC 1035: November 1987, Domain Names - Implementation and Specification
IETF RFC 1047: February 1988, Duplicate Messages and SMTP
IETF RFC 1056: June 1988, A Distributed Mail System for Personal Computers
IETF RFC 1176: August 1990, Interactive Mail Access Protocol
IETF RFC 1652: July 1994, SMTP Service Extension for 8bit-MIMEtransport
IETF RFC 1847: October 1995, Security Multiparts for MIME: Multipart/Signed and Multipart/Encrypted
IETF RFC 1869: November 1995, SMTP Service Extensions
IETF RFC 1870: November 1995, SMTP Service Extension for Message Size Declaration
IETF RFC 1939 (STD 53): May 1996, Post Office Protocol - Version 3
IETF RFC 1985: August 1996, SMTP Service Extension for Remote Message Queue Starting
IETF RFC 2045: November 1996, Multipurpose Internet Mail Extensions (MIME) Part One: Format of Internet Message Bodies
IETF RFC 2047: November 1996, MIME (Multipurpose Internet Mail Extensions) Part Three: Message Header Extensions for Non-ASCII Text
IETF RFC 2119: March 1997, Key Words for Use in IETF RFCs to Indicate Requirement
IETF RFC 2156: January 1998, MIXER (Mime Internet X.400 Enhanced Relay): Mapping between X.400 and IETF RFC 822/MIME
IETF RFC 822: August 1982, Standard for the format of ARPA Internet text messages, STD 11
IETF RFC 937: February 1985, Post Office Protocol: Version 2
IETF RFC 959(STD 9): October 1985, File Transfer Protocol