An email verifier that shows its work.
A label alone asks you to take it on trust. BounceOwl gives you the evidence, charges only for real answers, and gets cheaper the more people use it.
Proof, not a score.
A result tells you which server we spoke to, whether it accepted the mailbox, and whether the domain accepts every address. That's what lets you decide on the risky ones instead of throwing them all away.
See how a check works
Six things you get on every check
- Evidence on every result
- You see the mail server, the provider or security gateway, the mailbox answer and the catch-all test. Not just a label.
- Checked this week? Free
- If anyone on BounceOwl checked the address in the last 7 days, you get that result free, with its date.
- Unknown never costs a credit
- Timeouts, blocks and unclear answers are free. So are bad syntax and domains with no mail server.
- Catch-all on demand, with refunds
- Run the deeper check only where it matters. If it can't decide, the credits come back.
- No subscription, no expiry
- Buy credits once and use them whenever. Unused list credits come back when the list finishes.
- Works where you work
- The app, a REST API, and an MCP server for ChatGPT, Claude, Codex, Cursor and other AI assistants.
What we promise
- We show our work
- Every verdict comes with the mail server, the mailbox answer and the catch-all test. If you disagree with a result, you can see exactly why we gave it.
- We don't charge for guesses
- If a server won't give a clear answer, the result is unknown and free. So are bad syntax, dead domains and addresses checked on BounceOwl this week.
- We don't publish numbers we can't prove
- You won't find an accuracy percentage on this site. When we have independent test data, we'll publish the method with it.
- We don't lock you in
- No subscription, no expiring credits, no minimum term. Buy what you need, and download your results whenever you like.
Comparing verifiers?
Side-by-side pages with sourced, dated facts, including where another tool is the better fit.
Check your next list before it costs you a domain.
100 free credits with Google sign-in. Pay as you go after that, and credits never expire.