smtp4dev Local Email Testing

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

INCLUDED FREE ALLOWANCE

BSD-3-Clause-licensed local fake SMTP server for testing email flows, with web UI, IMAP/POP3 access, SMTP logs and HTML preview; 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

Not a production email delivery service. Requires user-provided Windows, Linux, macOS or container runtime and storage; local/CI infrastructure costs are separate. SMTP relay features can send real messages if explicitly configured; protect the testing server from public exposure.

View official documentation

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