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The TCP/IP Guide
9 TCP/IP Application Layer Protocols, Services and Applications (OSI Layers 5, 6 and 7)
9 TCP/IP Key Applications and Application Protocols
9 TCP/IP File and Message Transfer Applications and Protocols (FTP, TFTP, Electronic Mail, USENET, HTTP/WWW, Gopher)
9 TCP/IP Electronic Mail System: Concepts and Protocols (RFC 822, MIME, SMTP, POP3, IMAP)
9 TCP/IP Electronic Mail Message Formats and Message Processing: RFC 822 and MIME
9 TCP/IP Enhanced Electronic Mail Message Format: Multipurpose Internet Mail Extensions (MIME)
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MIME Message Format Overview, Motivation, History and Standards
(Page 3 of 3)
MIME Standards
MIME was first described in a set
of two standards, RFC 1341 and RFC 1342, published in June 1992. These
were updated by RFCs 1521 and 1522 in September 1993. In March 1994,
a supplemental standard was published, RFC 1590, which specified the
procedure for defining new MIME media types.
Work continued on MIME through the
mid-1990s, and in November 1996 the standards were revised again. This
time, the documents were completely restructured and published as a
set of 5 individual standards. This was done to improve the readability
of the information. These standards are shown in Table 241.
Table 241: Multipurpose Internet Mail Extensions (MIME) Standards
RFC Number
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Name
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Description
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2045
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Multipurpose
Internet Mail Extensions (MIME) Part One: Format of Internet Message
Bodies
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Describes the fundamental concepts
behind MIME and the structure of MIME messages.
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2046
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Multipurpose
Internet Mail Extensions (MIME) Part Two: Media Types
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Explains the
concept of MIME media types and subtypes and describes some of the kinds
of media whose encoding is defined in the MIME standards.
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2047
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MIME (Multipurpose
Internet Mail Extensions) Part Three: Message Header Extensions for
Non-ASCII Text
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Describes how RFC 822 headers
can be modified to carry non-ASCII text.
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2048
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Multipurpose
Internet Mail Extensions (MIME) Part Four: Registration Procedures
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Discusses how
organizations can register additional media types for use with MIME.
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2049
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Multipurpose
Internet Mail Extensions (MIME) Part Five: Conformance Criteria and
Examples
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Provides additional implementation
information and examples of how MIME can be used.
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Since the time that these
five primary MIME standards came out, numerous additional
RFCs have been published. These have defined various extensions to MIME
itself, including additional MIME header types and new media types.
Notable examples are RFCs 2183 and 2557, which define the MIME Content-Disposition
and Content-Location headers, respectively. Some other MIME capabilities
are actually defined as part of other technologies that use MIME; for
example, the first HTTP
standard, RFC 1945 defines the Content-Length header. Numerous
other RFCs define new media types/subtypes, too many to list here.
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Version 3.0 - Version Date: September 20, 2005
© Copyright 2001-2005 Charles M. Kozierok. All Rights Reserved.
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