Citadel is a collaboration suite (messaging and groupware). It provides support for Email, Calendaring/Scheduling, Address books, Bulletin boards, Mailing List Server, Instant Messaging, Wiki, Multiple domain support.

Its features include:

Email, calendaring, address books, bulletin boards, instant messaging, and more … all in one tightly integrated server package. Unlike other open source groupware systems, all of Citadel's data stores are built-in. All that tedious mucking about with dependencies and config files is a thing of the past.
High-performance, multiprotocol, multithreaded server engine
Web browser, telnet/SSH, local client software accessible
Standards-compliant e-mail built in: IMAP, POP3, ESMTP
Group calendaring and scheduling (GroupDAV and Kolab-1 compatible)
Built-in listserv (mailing list server)
Integrated server-side mail sorting and filtering. Users can choose between an easy-to-use web based rules editor, or the power of writing complex scripts using the industry standard Sieve language.
Support for push e-mail and mobile devices
Database-driven, single-instance message store
Built-in full text index for fast searching
Authenticated SMTP for remote email submission
Multiple domain support
Built-in integration with perimiter email filtering technologies such as Realtime Blackhole Lists (RBL's), SpamAssassin, and ClamAV antivirus
Server-to-server replication. Users in any number of domains can be spread out across any number of Citadel servers, allowing you to put data where you need it, and enabling infinite horizontal scalability.
Web-based access to email, calendars, and everything else through a powerful AJAX-style front end
Very strong support for “public folders” and message forums.
Built-in instant messenger service
SSL/TLS encryption for all protocols
Citadel is true open source software. Unlike other groupware servers, it isn't a cut-down version of an expensive proprietary “pro” version. We make our very best work available to everyone on the same terms. 100% of our code is covered by the GNU General Public License (GPL3).

Suggested keywords:

deepOfix - Mail Server

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