MailProof
ContactStart verifying
Verification consoleDomain-only mode

Clean a list before it costs you.

Check one address, paste a few thousand, or drop in a CSV. Every result comes back with the evidence behind it — and nothing you upload is ever stored.

Want to know if each mailbox is real?

Right now this checks the domain. To confirm the mailbox itself — the part before the @ — run the free helper once. It does the SMTP check a browser can’t, entirely on your machine. Full setup guide →

node mailproof-helper.js