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WhoisXml Email Verification REST API v1.0

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.