SM

smtp4dev

smtp4dev is a fake SMTP email server for development and testing that intercepts emails sent from applications and displays them in a web interface, preventing real email delivery. It supports SMTP, IMAP, TLS/SSL, authentication, and scripting for advanced testing scenarios.
Latest: 3.10.3
Last checked: Mar 3, 2026 7:05pm
Rank: 4223/15140
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Overview

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License: Open SourceInstaller: Standalone binary, .NET Core tool, Docker containerWinget: Available

Version & Lifecycle

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Current: 3.10.3 N-2: 3.10.1 Avg cadence: Every 6 days

Top Contributors

Top sitewide contributors:

  1. Anbarasan
  2. nico_k
  3. Bob
  4. Vigneshwaran

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Release Notes & Updates

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Smtp4dev

Packaging Notes

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Available as standalone binaries for Windows, Linux, .NET Core runtime dependent version, and Docker images

Notes

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Older v2 Windows-only GUI version available separately. Requires .NET Core 3.1 or later runtime for some versions. Docker usage recommended for ease of deployment.