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E-MailRelaychasquid
Free

Free and open source under the GPL-3.0 licence.

 Free

Free and open source under the Apache 2.0 licence.

Windows, Linux, Self-hosted, Command line Linux, Self-hosted
  • Few dependencies and easy to build
  • Runs without installation on Windows
  • Secure defaults that prevent open relays
  • Virtual domains with per-domain users and aliases
  • Policies such as retries and bounces need your own scripts
  • Configured mainly through command-line options
  • Aimed at individuals and small groups rather than large deployments
  • Needs Dovecot or similar for mailbox access
Downloadable app Downloadable app, Self-hosted
Open source Open source
License: GPL-3.0 License: Apache-2.0
No account needed No account 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.