Usually requires an API key and involves a per-check cost.
// Level 4: SMTP check (optional – use carefully) // if (!$this->smtpCheck($email)) // $this->errors[] = "Mailbox does not exist"; // return false; // email checker php
$email = "user@example.com"; $domain = substr(strrchr($email, "@"), 1); if (checkdnsrr($domain, "MX")) echo "The domain exists and can receive email."; else echo "The domain does not have a valid mail server."; Use code with caution. Usually requires an API key and involves a per-check cost