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Cyrus IMAPXandikos
Free

Free and open source.

 Free

Free and open source under the GPL-3.0 licence.

Linux, Self-hosted Linux, Self-hosted
  • Mail, calendars and contacts in one server
  • JMAP support alongside IMAP
  • Git-backed storage with change history
  • Broad, documented standards coverage
  • Complex to configure compared with all-in-one servers
  • No bundled webmail
  • No built-in web interface for managing calendars
  • WebDAV LOCK operations not implemented
Self-hosted Self-hosted
Open source Open source
License not stated License: GPL-3.0
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.