Trial abusers rotate throwaway inboxes to sign up again and again. We check every address against 70,000+ disposable domains, updated continuously, so one person can’t become fifty “users”.

[email protected] signs up, never gets your confirmation email, and disappears. We spot the misspelling and return the correction so the signup actually sticks.

Every email you send to a fake address hurts deliverability for the real ones. Verify at the door and your welcome emails keep landing in inboxes, not spam folders.

Sub-100ms responses mean you can verify inline, before the account is created. No background jobs, no spinners — one REST call, one JSON answer.