Description:

Mailman -- The GNU Mailing List Management System -- is a mailing list
management system written mostly in Python. Features:
- most standard mailing list features, including: moderation, mail
based commands, digests, etc...
- an extensive Web interface, customizable on a per-list basis,
- web based list administration interface for *all* admin-type tasks
- automatic Web based hypermail-style archives (using pipermail or
other external archiver), including provisions for private archives
- integrated mail list to newsgroup gatewaying
- integrated newsgroup to mail list gatewaying (polling-based... if
you have access to the nntp server, you should be able to easily do
non-polling based news->mail list gatewaying; email viega@list.org
(I'd like to help get that going and come up with instructions)
- smart bounce detection and correction
- integrated fast bulk mailing
- smart spam protection
- extensible logging
- multiple list owners and moderators are possible
- optional MIME-compliant digests,
- nice about which machine you subscribed from if you're from the
right domain,

See the Mailman home site for current status, including new releases and
known problems: http://mailman.sourceforge.net.