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WhoisXml Email Verification REST API v1.0 - Developers

The Whois XML Email Verification API is a validation tool to check the existence, validity, and quality of 300+ million email addresses. It verifies for syntax, typos and curse words, disposable email address, mail server existence, mailbox existence, and catch-all email addresses. It can be used to segment potentially dangerous emails and verify new user registration. Developers can make up to 1,000 queries per month for free.
WhoisXml Email Verification