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(emacs-mime)Conversion

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Conversion
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   A (multipart) MIME message can be converted to MML with the
`mime-to-mml' function.  It works on the message in the current buffer,
and substitutes MML markup for MIME boundaries.  Non-textual parts do
not have their contents in the buffer, but instead have the contents in
separate buffers that are referred to from the MML tags.

   An MML message can be converted back to MIME by the `mml-to-mime'
function.

   These functions are in certain senses "lossy"--you will not get back
an identical message if you run MIME-TO-MML and then MML-TO-MIME.  Not
only will trivial things like the order of the headers differ, but the
contents of the headers may also be different.  For instance, the
original message may use base64 encoding on text, while MML-TO-MIME may
decide to use quoted-printable encoding, and so on.

   In essence, however, these two functions should be the inverse of
each other.  The resulting contents of the message should remain
equivalent, if not identical.