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Simple NixOS MailserverHomeServerHQ
Free

Free and open source under the GPL-3.0 licence.

 Free

Free and open source; optional paid professional support membership.

Linux, Self-hosted Linux, Self-hosted
  • Whole mail server defined declaratively in NixOS configuration
  • Releases track each NixOS release
  • Works behind CGNAT without open ports
  • Email server, VPN and websites set up together
  • Only works on NixOS
  • Running a mail server still requires DNS and deliverability knowledge
  • Requires a domain name and a separate VPS relay
  • Small community
Self-hosted Self-hosted, Operating system
Open source Open source
License: GPL-3.0 License: GPL-3.0
Not stated if an account is needed Not stated if an account is needed
Not stated if it works offline Not stated if it works offline

Checked October 2, 2026

Checked October 2, 2026

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