smtp-dev-server

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

INCLUDED FREE ALLOWANCEFree BSD-3-Clause local SMTP capture server for macOS and Linux with a browser UI; retains up to 500 messages by default (configurable with -max-messages), with no provider-imposed subscription 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

Development/testing only: accepts arbitrary SMTP AUTH credentials, binds to localhost by default, and does not deliver real email. Messages are stored locally; do not expose its SMTP/UI ports publicly. Hosting and storage are user-provided; this is a distinct Go implementation inspired by smtp4dev.

View official documentation

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