Compare software

smtp4devMailpit
Free

Free to download, with the source code published on GitHub.

 Free

Free to download and run.

Web, Self-hosted Web, Self-hosted, Command line
  • Captures outgoing email so test messages never reach real inboxes
  • Web interface for inspecting captured messages
  • Single binary or Docker image with no dependencies
  • HTML compatibility, link and spam checks built in
  • Meant for development and testing, not for sending real mail
  • Documentation lives mainly in the repository
  • For testing only, not a real mail client
  • Spam scoring relies on a SpamAssassin setup
Downloadable app, Self-hosted Downloadable app, Self-hosted
Closed source Open source
License not stated License not stated
No account needed No account needed
Works offline Works offline

Checked October 2, 2026

Checked September 24, 2026

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