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MailCatcher

Catch-all SMTP server for inspecting test email

Mail Servers ★ 6.8k stars Easy setup MIT

MailCatcher runs a simple SMTP server that catches any message sent to it and displays it in a web interface for developers. It is a development tool for inspecting outgoing email without delivering it.

Official siteSource code

Key features

  • Catch-all SMTP server
  • Web UI for inspecting mail
  • View HTML and plain text
  • Developer testing tool

Strengths

  • Released under the MIT license
  • Easy to set up — beginner-friendly
  • First-class Docker support for quick deployment
  • Mature project with 6.8k GitHub stars

Is MailCatcher secure?

OSV.dev has no published security advisories for MailCatcher'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.

MailCatcher replaces

Self-hosted Mailtrap alternatives

Health badge

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

SelfHostIndex: 72 · good

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   :alt: SelfHostIndex health score for MailCatcher
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The score is recomputed on every nightly rebuild from public repository data — see how it is calculated.

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