nullmail API for Developers
Every inbox on this site runs on an API, and that API is available to you. Create disposable addresses programmatically, poll for incoming mail, and pull extracted OTP codes straight into your test suite.
How it works
REST endpoints on api.nullmail.email: mint an address, list its messages, read message bodies. JWT auth, JSON responses, no SDK required. If you can curl, you can integrate in an afternoon.
Free sandbox
Use the public limits free, no key needed: up to 10 new addresses per minute per IP, 100 messages per list request, inboxes that expire and purge automatically. Enough for prototyping and light CI.
Team early access
Higher rate limits, longer retention windows, and priority support for teams running signup flows, OTP verification, and deliverability tests at volume. Founding members lock launch pricing.
Running tests that need inboxes? Tell us your volume.
Request API access →Include your monthly test volume and whether you need OTP extraction. We reply within 2 business days.
Last updated: 2026-09-27