Is Mailcatcher Safe?
Mailcatcher — Nerq Trust Score 66.8/100 (B- grade). Based on analysis of 2 trust dimensions, it is generally safe but has some concerns. Last updated: 2026-05-20.
Use Mailcatcher with some caution. Mailcatcher is a Ruby gem with a Nerq Trust Score of 66.8/100 (B-), based on 3 independent data dimensions. Below the recommended threshold of 70. Security: 90/100. Popularity: 90/100. Data sourced from rubygems.org, GitHub, and NVD. Last updated: 2026-03-22. Machine-readable data (JSON).
Is Mailcatcher safe?
CAUTION — Mailcatcher has a Nerq Trust Score of 66.8/100 (B-). It has moderate trust signals but shows some areas of concern that warrant attention. Suitable for development use — review security and maintenance signals before production deployment.
What is Mailcatcher's trust score?
Mailcatcher has a Nerq Trust Score of 66.8/100, earning a B- grade. This score is based on 2 independently measured dimensions including security, maintenance, and community adoption.
What are the key security findings for Mailcatcher?
Mailcatcher's strongest signal is security at 90/100. No known vulnerabilities have been detected. It has not yet reached the Nerq Verified threshold of 70+.
What is Mailcatcher and who maintains it?
| Author | Samuel Cochran |
| Category | Ruby Gems |
| Source | N/A |
Mailcatcher Across Platforms
Same developer/company in other registries:
Similar Gems by Trust Score
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.
Trust Assessment
Mailcatcher has a Nerq Trust Score of 67/100 (B-) and has not yet reached Nerq trust threshold (70+). This score is based on automated analysis of security, maintenance, community, and quality signals.
Key Takeaways
- Mailcatcher has a Trust Score of 67/100 (B-).
- Review carefully before use — below trust threshold.
- Always verify independently using the Nerq API.
Detailed Score Analysis
| Dimension | Score |
|---|---|
| Security | 90/100 |
| Maintenance | 50/100 |
| Popularity | 90/100 |
| Quality | 65/100 |
| Community | 35/100 |
Based on 5 dimensions. Data from rubygems.org, GitHub, and NVD.
What data does Mailcatcher collect?
Privacy assessment for Mailcatcher is not yet available. See our methodology for how Nerq measures privacy, or the public privacy review for any community-contributed notes.
Is Mailcatcher secure?
Security score: 90/100. This meets the recommended security threshold for production use.
Nerq monitors this entity against NVD, OSV.dev, and registry-specific vulnerability databases for ongoing security assessment.
Full analysis: Mailcatcher Security Report
Mailcatcher Across Platforms
Same developer/company in other registries:
How we calculated this score
Mailcatcher's trust score of 66.8/100 (B-) is computed from rubygems.org, GitHub, and NVD. The score reflects 5 independent dimensions: security (90/100), maintenance (50/100), popularity (90/100), quality (65/100), community (35/100). Each dimension is weighted equally to produce the composite trust score.
Nerq analyzes over 7.5 million entities across 26 registries using the same methodology, enabling direct cross-entity comparison. Scores are updated continuously as new data becomes available.
This page was last reviewed on May 20, 2026. Data version: 0.0.
Full methodology documentation · Machine-readable data (JSON API)
Frequently Asked Questions
Is Mailcatcher Safe?
What is Mailcatcher's trust score?
What are safer alternatives to Mailcatcher?
Does Mailcatcher have known vulnerabilities?
Is Mailcatcher actively maintained?
Popular in Ruby Gems
See Also
Disclaimer: Nerq trust scores are automated assessments based on publicly available signals. They are not endorsements or guarantees. Always conduct your own due diligence.