maildotnull Local Email and Provider API Testing

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

INCLUDED FREE ALLOWANCEMIT-licensed local SMTP testing server with web inbox and emulated Resend, SendGrid and Amazon SES send APIs; no vendor-imposed software usage limit 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): 2026-11-04
Last checked: 2026-11-04

Important restrictions

Self-host on your own machine or Docker infrastructure; messages are held in memory and the inbox retains at most 1.000 messages. Not a hosted email sending allowance or production mail delivery service.

View official documentation

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