Email Checker Online

Email Checker Online validates addresses one at a time or in bulk, with MX and SMTP checks behind each result. Uploaded lists are processed and then discarded rather than retained, which matters when the list is your customer base.

Typical use is list hygiene before a campaign: removing addresses that no longer exist, catching typos in signup forms, and separating role accounts from personal ones. There is an API for teams that want the check to happen at registration instead of after the fact.