Know before you send.
Upload a CSV, get back three clean buckets — send_safe, risky, and invalid — with full DNS validation and typo correction in seconds.
Real mailbox verification
We ask the recipient's mail server whether each mailbox exists — plus syntax, DNS A/MX, disposable, role-based, catch-all and typo detection. No email is ever sent.
Fast & parallel
Concurrent DNS lookups with a 7-day intelligent cache so repeated domains resolve instantly.
Three-bucket exports
Results split into send_safe, risky, and invalid CSVs — ready to import into any ESP.