About the Email Validator
The Email Validator combines a strict syntax check with a live MX lookup: an address only counts as deliverable when its domain actually operates mail servers. Ideal before newsletter imports and for weeding out typo domains that would bounce.
No — it proves the address is well-formed and the domain runs mail servers. Whether the specific mailbox exists only shows at delivery time (or via SMTP probing, which most providers block).
Typo domains (gmial.com) often pass syntax but have no mail servers — the MX lookup catches exactly these dead addresses before they bounce.
Yes — paste up to 20 addresses, one per line. For pure format cleaning of bigger lists, use the client-side Email Syntax Checker.