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Harakachasquid
Free

Free open-source software.

 Free

Free and open source under the Apache 2.0 licence.

Linux, Self-hosted, Command line Linux, Self-hosted
  • High performance SMTP handling
  • Flexible plugin system in JavaScript
  • Secure defaults that prevent open relays
  • Virtual domains with per-domain users and aliases
  • Handles SMTP only; needs other software for mailbox access
  • Customisation requires JavaScript knowledge
  • Aimed at individuals and small groups rather than large deployments
  • Needs Dovecot or similar for mailbox access
Downloadable app, Self-hosted Downloadable app, Self-hosted
Open source Open source
License not stated License: Apache-2.0
No account needed No account needed
Not stated if it works offline Not stated if it works offline

Checked October 1, 2026

Checked October 2, 2026

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