2.5 MIME

Message is a MIME-compliant posting agent. The user generally doesn't have to do anything to make the MIME happen--Message will automatically add the Content-Type and Content-Transfer-Encoding headers.

The most typical thing users want to use the multipart things in MIME for is to add "attachments" to mail they send out. This can be done with the C-c C-a command, which will prompt for a file name and a MIME type.

You can also create arbitrarily complex multiparts using the MML language (see section `Composing' in The Emacs MIME Manual).