re: How to validate an email address in JavaScript VIEW POST

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re: There are possibilities to validate if an email exists without sending an email. Your backend can open a socket the the email server of the email a...
 

This probably only works for a few percent of mail servers these days, most will accept any RCPT TO address, wait for the DATA block and then black hole or reply with an error via a separate outbound message. Specifically done to permit more filtering (anti-spam etc.) and to /prevent/ these sorts of validity checks as they are popular with spammers (can't think why :))

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