Compare software

chasquidE-MailRelay
Free

Free and open source under the Apache 2.0 licence.

 Free

Free and open source under the GPL-3.0 licence.

Linux, Self-hosted Windows, Linux, Self-hosted, Command line
  • Secure defaults that prevent open relays
  • Virtual domains with per-domain users and aliases
  • Few dependencies and easy to build
  • Runs without installation on Windows
  • Aimed at individuals and small groups rather than large deployments
  • Needs Dovecot or similar for mailbox access
  • Policies such as retries and bounces need your own scripts
  • Configured mainly through command-line options
Downloadable app, Self-hosted Downloadable app
Open source Open source
License: Apache-2.0 License: GPL-3.0
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.