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Simple NixOS MailserverMox
Free

Free and open source under the GPL-3.0 licence.

 Free

Free and open source.

Linux, Self-hosted Linux, Self-hosted
  • Whole mail server defined declaratively in NixOS configuration
  • Releases track each NixOS release
  • Single program covering SMTP, IMAP and webmail
  • Built-in DKIM, SPF, DMARC, MTA-STS and DANE
  • Only works on NixOS
  • Running a mail server still requires DNS and deliverability knowledge
  • Younger and less widely deployed than Postfix and Dovecot
  • Deliverability still depends on your IP reputation and DNS
Self-hosted Self-hosted
Open source Open source
License: GPL-3.0 License not stated
Not stated if an account is needed No account needed
Not stated if it works offline Not stated if it works offline

Checked October 2, 2026

Checked September 24, 2026

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