Acronym for Multipurpose Internet Mail Extensions
The format for modern email messages, this specifies how to encode attachments, and non-text bodies. It also includes a type system, allowing type information to be included with message parts, and a means of specifying non-ASCII text in message headers.
The MIME standards build on the message format specified in 
RFC:822 (now updated to RFC:2822), so a MIME message is also an RFC:822 message, hence can be sent using standard internet protocols (such as SMTP)
MIME is currently a set of 5 RFCs: 1?
RFC:2045 - Basic specification for MIME messagesRFC:2046 - MIME media typing system, and core type definitionsRFC:2047 - RFC:822 extensions to allow non-ASCII data in message headersRFC:2048 - IANA registration procedures for MIME related facilitiesRFC:2049 - MIME conformance criteriaThese documents revise older versions of the MIME standard, such as RFC:1341 and RFC:1342
1? There are a bunch of additions, but these include most of the important basics
14 pages link to MIME:
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