courier-mlm - 1.0.16-3+b6 main

The Courier mail transfer agent (MTA) is an integrated mail/groupware
server based on open commodity protocols, such as ESMTP, IMAP, POP3,
LDAP, TLS, and HTTP. Courier provides ESMTP, IMAP, POP3, webmail, and
mailing list services within a single, consistent, framework.
.
The couriermlm command sets up, maintains, and runs a mailing list.
It automatically handles subscribe and unsubscribe requests, and
removes undeliverable addresses from the subscription rolls. Mailing
lists managed by couriermlm require zero human administrative
oversight. It supports digests, write-only posting aliases, and
moderated mailing lists.