* Message: (message). Mail and news composition mode that goes with Gnus.
* MH-E: (mh-e). Emacs interface to the MH mail system.
* MIME: (emacs-mime). Emacs MIME de/composition library.
+* PGG: (pgg). Emacs interface to various PGP implementations.
* SC: (sc). Supercite lets you cite parts of messages you're
replying to, in flexible ways.
* SMTP: (smtpmail). Emacs library for sending mail via SMTP.
+* Sieve: (sieve). Managing Sieve scripts in Emacs.
* Autotype: (autotype). Convenient features for text that you enter frequently
in Emacs.