Mailtrap Local Email Sandbox

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

INCLUDED FREE ALLOWANCEFree MIT-licensed local SMTP email catcher with web UI, JSON API, HTML compatibility checks and SQLite storage; no vendor-imposed software usage quota or expiry.

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): 2026-11-05
Last checked: 2026-11-05

Important restrictions

Local single-developer tool, not Mailtrap's hosted Email API or cloud Sandbox. No team accounts, authentication, multi-tenancy or high availability; macOS/Linux builds, Windows not yet supported. Default localhost-only SMTP/HTTP ports 3.535/3550; releasing messages to a real SMTP provider can incur separate charges.

View official documentation

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