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Courier Mail ServeriRedMail
Free

Free and open-source software.

 Free

Free and open source, self-hosted.

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

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