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smtp4devMailHog
Free

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

 Free

Free and open source under the MIT licence.

Web, Self-hosted Windows, macOS, Linux, Self-hosted, Command line
  • Captures outgoing email so test messages never reach real inboxes
  • Web interface for inspecting captured messages
  • Single Go binary that runs without installation
  • Web UI and API for inspecting captured mail
  • Meant for development and testing, not for sending real mail
  • Documentation lives mainly in the repository
  • Little development activity; last commit in early 2024
  • Intended for testing, not for delivering production mail
Downloadable app, Self-hosted Downloadable app, Self-hosted
Closed source Open source
License not stated License: MIT
No account needed No account needed
Works offline Works offline

Checked October 2, 2026

Checked October 2, 2026

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