Free disposable email checker: audit your signups in seconds
Paste a list of signup emails or domains and see how many are disposable, legitimate, or unknown in seconds.
The part before the @ never leaves your browser. We only ever see the domain.
The part before the @ never leaves your browser. We only ever see the domain.
Counts only
We return totals, never the addresses you pasted.
Domain-only
Your browser strips local parts before sending anything.
No card needed
Sign up free to see exactly which domains are disposable.
What is a disposable email address?
Someone creates a disposable email address to receive one message, then abandons it. Mailinator, 10 Minute Mail, and hundreds of rotating lookalikes let anyone spin up a working inbox in seconds with no verification, which is how people skip email confirmation, claim a “new signup” discount more than once, or join a list without ever intending to read it. A single blocklist entry rarely stops this for long, since the domain name behind the inbox is often disposable too.
For the full breakdown of the different disposable-email setups and why they hurt deliverability, see the disposable email detection API page.
How this free disposable email checker works
Every domain you paste runs through the same detection cascade behind Mailsurity's API: a curated known-legitimate list, a 220k+ domain list of confirmed disposable providers, cached verdicts from past checks, and live heuristics (with an AI fallback for genuinely ambiguous, brand-new domains). That last layer is what catches a throwaway domain that was registered five minutes ago and has never appeared on any public list, which is the gap a static blocklist can't close.
The audit runs the same cascade as the API, so the counts above show real detection quality, not a watered-down demo. See the full 5-layer cascade, comparison to other tools, and code samples on the disposable email detection API page.
Frequently asked questions
Want this running on every signup, not just this audit?
Sign up free for a bearer-token API you can call on every signup (500 free checks, no card), or upload a full customer list from your dashboard. Read how the cascade works on the disposable email detection API page, compare plans and pricing, or jump straight into the API reference.