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iRedMailCourier Mail Server
Free

Free and open source, self-hosted.

 Free

Free and open-source software.

Linux, Self-hosted Linux, Self-hosted
  • Long-established project with broad Linux and BSD distribution support
  • Automates installation of a full mail stack in one script
  • SMTP, IMAP, POP3, webmail and mailing lists in one package
  • Components can be switched on or off individually
  • Requires server administration skills to deploy and maintain
  • Text-based installer is less approachable than fully containerized alternatives
  • Built from source on POSIX systems, with no Windows support
  • Calendaring in the webmail is basic
Self-hosted Self-hosted
Open source Open source
License not stated 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 September 22, 2026

Checked October 2, 2026

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