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Cyrus IMAPDavis
Free

Free and open source.

 Free

Free and open source under the MIT licence.

Linux, Self-hosted Web, Self-hosted
  • Mail, calendars and contacts in one server
  • JMAP support alongside IMAP
  • Web dashboard for users, calendars and address books
  • IMAP and LDAP authentication options
  • Complex to configure compared with all-in-one servers
  • No bundled webmail
  • Requires PHP 8.2 or later and a database
  • Single main maintainer
Self-hosted Self-hosted
Open source Open source
License not stated License: MIT
No account needed Not stated if an account is needed
Not stated if it works offline Not stated if it works offline

Checked September 24, 2026

Checked October 2, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.