MailCatcher Local SMTP Testing

Explore this developer service’s ongoing no-cost allowance, restrictions and official documentation before deploying.

INCLUDED FREE ALLOWANCE

MIT-licensed Ruby gem running a local SMTP capture server and browser UI for inspecting application test emails; no software usage quota or hosted sending allowance.

View official documentation

Plan details

What do these plan and deployment labels mean?

Plan: Ongoing free allowance
Deployment model: Local / embedded
Credit card: Not required
Commercial use: Allowed
Added to directory (UTC): 2026-11-03
Last checked: 2026-11-03

Important restrictions

For development and testing only, not a production SMTP delivery service. Requires a compatible Ruby runtime and local/CI resources; messages are captured rather than delivered to customers, and test content may be sensitive.

View official documentation

Independent community listing, not affiliated with the provider. Always check the latest billing policy and quotas before enabling paid usage.