# MailCatcher

Email catcher that runs an SMTP server and shows the received messages in a web interface, written in Ruby.


Source: https://findsoftware.frbit.cloud/mailcatcher/
Last reviewed: 2026-11-03
Listed since: 2026-11-03

## Record

### Links

- home: https://mailcatcher.me
- repository: https://github.com/sj26/mailcatcher

### Identity

- status: active
- maintainer: Samuel Cochran
- maintainerType: individual
- parent: unknown
- firstRelease: 2010
- hqCountry: unknown

### Kind

- category: dev-tool, email
- hosting: ruby
- language: ruby
- runtime: ruby
- runtimeMin: ruby 3.3
- basedOn: unknown

### Content

- contentStore: not applicable
- databases: not applicable
- adminUi: not applicable
- headlessApi: rest
- templating: not applicable
- i18n: not applicable

### Rendering and deploy

- runsAs: always-on
- renderingModes: not applicable
- installMethod: gem install

### License

- licenseModel: open-source
- license: MIT

### Releases

- currentMajor: 0
- latestReleaseDate: 2026-09-02

### Adoption

- githubStargazers: 6783
- packagistDownloads: not applicable
- npmWeeklyDownloads: not applicable
- contributors: 51
- pluginCount: unknown
- packagistMonthlyDownloads: unknown
- ecosystemsMonthlyDownloads: unknown
- httpArchiveSites: unknown
- wordpressActiveInstalls: unknown
- dependentRepos: unknown
- dependentPackages: unknown

### Sources

- urls: https://mailcatcher.me/ (read 2026-11-03)
- urls: https://api.github.com/repos/sj26/mailcatcher (read 2026-11-03)
- maintainer: https://github.com/sj26/mailcatcher/blob/main/LICENSE (read 2026-11-03)
- maintainerType: https://github.com/sj26/mailcatcher/blob/main/LICENSE (read 2026-11-03)
- category: https://mailcatcher.me/ (read 2026-11-03)
- language: https://api.github.com/repos/sj26/mailcatcher (read 2026-11-03)
- runtime: https://github.com/sj26/mailcatcher/blob/main/README.md (read 2026-11-03)
- runtimeMin: https://github.com/sj26/mailcatcher/blob/v0.11.0/mailcatcher.gemspec (read 2026-11-03)
- installMethod: https://github.com/sj26/mailcatcher/blob/main/README.md (read 2026-11-03)
- installMethod: https://github.com/sj26/mailcatcher/blob/main/README.md (read 2026-11-03)
- runsAs: https://github.com/sj26/mailcatcher/blob/main/README.md (read 2026-11-03)
- license: https://github.com/sj26/mailcatcher/blob/main/README.md (read 2026-11-03)
- licenseModel: https://api.github.com/repos/sj26/mailcatcher (read 2026-11-03)
- firstRelease: https://rubygems.org/api/v1/versions/mailcatcher.json (read 2026-11-03)
- currentMajor: https://github.com/sj26/mailcatcher/releases/tag/v0.10.0 (read 2026-11-03)
- githubStargazers: https://api.github.com/repos/sj26/mailcatcher (read 2026-11-03)
- latestReleaseDate: https://rubygems.org/api/v1/versions/mailcatcher.json (read 2026-11-03)
- contributors: https://api.github.com/repos/sj26/mailcatcher/contributors?per_page=1 (read 2026-11-03)
- headlessApi: https://github.com/sj26/mailcatcher/blob/main/README.md (read 2026-11-03)

## Notes

MailCatcher is an email catcher written in Ruby. It runs an SMTP server that catches every message sent to it and shows the messages in a web interface, so an application can be pointed at it and the mail is displayed rather than delivered. A REST-style URL schema also serves the messages as JSON. It runs as a daemon in the background, and it is installed with `gem install` or started from its Docker image.

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Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Attributes are recorded, never scored; absent means unknown.
Credit, in full: FindSoftware, CC BY 4.0