Free MIME Resources
IANA MIME Media Types
The Internet Corporation for Assigned Names and Numbers list of Content Types and Subtypes.
Multipurpose Internet Mail Extensions Tutorial with introduction, background, technical specifications and examples.
Listing of mime types: application, audio, image, message, multipart, text and video.
A list of links to RFCs and other reference links for MIME.
Email Protocols : SMTP, MIME, POP and IMAP
These are presentation slides including information about smtp, and the other email protocols