: No validation method is 100% foolproof. Always combine domain validation with other techniques like email confirmation links for critical applications.
// Use the mail exchanger with highest priority $mx_host = $mx_records[0]; validate email domain php
if (!$connection) return false;
function validateEmailDomain($email) // Extract domain from email $domain = substr(strrchr($email, "@"), 1); // Check for MX records if (getmxrr($domain, $mx_records)) return true; : No validation method is 100% foolproof
// SMTP conversation fputs($connection, "HELO yourdomain.com\r\n"); $response = fgets($connection, 1024); if (!$connection) return false
// Connect to SMTP server $connection = @fsockopen($mx_host, 25, $errno, $errstr, 10);