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Citadel is a highly integrated Groupware Platform with a AJAX-powered “Web 2.0” interface, but also providing SMTP, IMAP, POP3 and GroupDAV access to its content.

Citadel offers versatile email services with very low administration needed. It provides its own implementations of these server protocols: IMAP, POP3, SMTP, ManageSieve, XMPP, Citadel.

It is 100% free open source, its codebase is written mostly in C.

Feature list

Provided Services

Mail Transfer Agent

Groupware/BBS Style Services

Clients and Tools


Optional auth mechanisms

Operating Systems



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