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smtp4devInbucket
Free

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

 Free

Free and open source under the MIT licence.

Web, Self-hosted Windows, Linux, Self-hosted
  • Captures outgoing email so test messages never reach real inboxes
  • Web interface for inspecting captured messages
  • Accepts mail for any address without setup
  • Web interface plus SMTP and POP3
  • Meant for development and testing, not for sending real mail
  • Documentation lives mainly in the repository
  • Meant for testing, not for real mail delivery
  • You run and maintain the server yourself
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.