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swaks

Swiss Army knife for SMTP testing

Mail Servers ★ 1.3k stars Easy setup GPL-2.0

swaks is a flexible command-line SMTP transaction tester used to diagnose and verify self-hosted mail servers. It can craft and send test messages with fine control over the SMTP conversation.

Official siteSource code

Key features

  • Command-line SMTP tester
  • Fine control over SMTP transactions
  • Diagnoses mail server issues

Strengths

  • Released under the GPL-2.0 license
  • Easy to set up — beginner-friendly
  • Active community (1.3k GitHub stars)
  • Written in Perl

Is swaks secure?

OSV.dev has no published security advisories for swaks's repository. No known vulnerabilities is not proof of security: it means none have been publicly catalogued.

Source: OSV.dev, checked 2026-10-14. How this is measured.

swaks replaces

Self-hosted Mailtrap alternatives

Health badge

Maintain swaks? Add its health score to your README. The badge links back to this page.

SelfHostIndex: 15 · at risk

Markdown
[![SelfHostIndex health score for swaks](https://selfhostindex.com/badge/swaks.svg)](https://selfhostindex.com/app/swaks/)
HTML
<a href="https://selfhostindex.com/app/swaks/"><img src="https://selfhostindex.com/badge/swaks.svg" alt="SelfHostIndex health score for swaks"></a>
reStructuredText
.. image:: https://selfhostindex.com/badge/swaks.svg
   :alt: SelfHostIndex health score for swaks
   :target: https://selfhostindex.com/app/swaks/

The score is recomputed on every nightly rebuild from public repository data — see how it is calculated.

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