This is a port of VM, a mail program running in Emacs or XEmacs.

VM (View Mail) is an Emacs subsystem that allows UNIX mail to be read
and disposed of within Emacs. Commands exist to do the normal things
expected of a mail user agent, such as generating replies, saving
messages to folders, deleting messages and so on. There are other more
advanced commands that do tasks like bursting and creating digests,
message forwarding, and organizing message presentation according to
various criteria.

WWW: http://www.wonderworks.com/vm/

- Olivier Tharan
olive@oban.frmug.org