Bytecheck

Bytecheck verifies whether email addresses can receive mail using servers we operate ourselves, rather than reselling another vendor's results. You can upload a list, check a single address, or use the REST API. Unclear answers get a second check from a different server and remain marked unknown instead of being guessed. Duplicate emails in a list are charged only once. The email finder uses credits only when it actually finds an address. Pricing is based on one-off credit packs without subscriptions, ranging from 5,000 checks for $9 to 1,000,000 for $225. Free email checker and finder tools are available on the website. Built and run by Bytemine.