Is Mailcatcher Safe?

Mailcatcher — Nerq Trust Score 66.8/100 (B- grade). Score based on 2 independent trust signals. Last analyzed: 2026-03-22

Mailcatcher is a Ruby gem with a Nerq Trust Score of 66.8/100 (B-), based on 3 independent data dimensions. Last analyzed: 2026-03-22 Security: 90/100. Popularity: 90/100. Data sourced from rubygems.org, GitHub, and NVD. Last updated: 2026-03-22. Machine-readable data (JSON).

Mailcatcher Across Platforms

Same developer/company in other registries:

Safety Guide: Mailcatcher

What is Mailcatcher?

Mailcatcher is a Ruby gem — MailCatcher runs a super simple SMTP server which catches any message sent to it to display in a web interface. Run mailcatcher, set your favourite app to deliver to smtp://127.0.0.1:1.

How to Verify Safety

Run bundle audit. Review on rubygems.org.

You can also check the trust score via API: GET /v1/preflight?target=mailcatcher

Key Safety Concerns for Ruby gem

When evaluating any Ruby gem, watch for: dependency vulnerabilities, maintenance status.

Measured Signals

Mailcatcher has a Nerq Trust Score of 67/100 (B-). This score is a composite of automated measurements of security, maintenance, community, and quality signals.

Key Takeaways

• Mailcatcher has a Trust Score of 67/100 (B-).
• The score is a measured composite — it is not a suitability judgment. Evaluate the individual signals against your own requirements.
• Query the current measured values via the Nerq API.

Disclaimer: Nerq trust scores are automated measurements based on publicly available signals. They are not endorsements, verdicts, or guarantees of suitability. Always evaluate the signals against your own requirements.