The details of MIME data
can get real complicated. The following are the definitive standards. RFC 2045 Multipurpose Internet Mail Extensions (MIME) Part One: Format of Internet Message Bodies RFC 2046 Multipurpose Internet Mail Extensions (MIME) Part Two: Media Types RFC 2047 MIME (Multipurpose Internet Mail Extensions) Part Three: Message Header Extensions for Non-ASCII Text RFC 2048 Multipurpose Internet Mail Extensions (MIME) Part Four: Registration Procedures If you need to read them then just search and you will find. I assume this is more than what you need.
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