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MailHogPapercut SMTP
Free

Free and open source under the MIT licence.

 Free

Free and open source under the Apache-2.0 licence.

Windows, macOS, Linux, Self-hosted, Command line Windows, Self-hosted
  • Single Go binary that runs without installation
  • Web UI and API for inspecting captured mail
  • Catches test emails without sending them
  • Simple desktop interface for reading captured messages
  • Little development activity; last commit in early 2024
  • Intended for testing, not for delivering production mail
  • Meant for testing, not a real mail server
  • Desktop app is Windows-only
Downloadable app, Self-hosted Downloadable app, Self-hosted
Open source Open source
License: MIT License: Apache-2.0
No account needed No account needed
Works offline Works offline

Checked October 2, 2026

Checked October 2, 2026

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