Manuals and FAQs:

Mutt-1.2.5 Manual Mutt FAQ Sven Guckes' FAQ, Questions, and Answers German Manual (Mutt-1.2.5) Japanese Manual (Mutt-1.2) Spanish Manual (Mutt-1.0)

Guides and HOW-TOs:

Mutt and IMAP Mutt and GnuPG/PGP Mutt and GPG Mutt and Unicode Mutt and S-MIME The Mutt for Newbies Guide Mail administrator HOWTO

Mutt-1.2.5i:

ABOUT-NLS COPYRIGHT GPL INSTALL NEWS README.SECURITY README.SSL README.UPGRADE README TODO doc/PGP-Notes.txt imap/BUGS imap/README imap/TODO

Reference manuals:

Mail and News related RFCs Internet Mail