Paste an email address. We run all five checks — syntax, MX records, disposable detection, role-account flag, SMTP mailbox check — and tell you the truth. Free, right here, no account.
Most free checkers run a regex and call it a day. Here's what runs behind the button above:
RFC-aware parsing — catches typos like gmial.com without rejecting valid-but-exotic addresses.
Real DNS lookups. If the domain can't receive mail, the address can't be valid.
300+ temporary email providers flagged — the #1 source of fake signups.
info@, support@, admin@ flagged as low-engagement risks.
We ask the receiving server if the mailbox exists, then hang up. No email ever sent.
Valid / Invalid / Risky / Unknown. Uncheckable is "unknown" — never a false invalid.
Yes. 10 checks/hour per visitor, no signup, no card, no email capture. If you need volume, the API includes 100 free credits with every key.
Never. The SMTP check opens a connection, asks if the mailbox exists, reads the answer, and hangs up before any message is transmitted.
Yes — upload a CSV and get status, score, and reason per email, up to 50,000 per job. See the API docs →
Same core checks, but credits never expire and you can audit every verdict — each check is returned in the API response. ZeroBounce comparison → · NeverBounce comparison →
Free during beta · 100 free credits, no card.
Read the API docs