if ($validation['valid']) $success = "Email is valid! Proceeding..."; // Save to database, send confirmation, etc. $cleanEmail = filter_var($email, FILTER_SANITIZE_EMAIL); // Store $cleanEmail else $error = $validation['message'];
This checks that the email follows RFC 822/RFC 2822 standards – correct format, presence of @ symbol, valid domain characters, etc. It does not check if the domain actually exists. 2. Domain Validation (DNS Check) To verify the domain has valid MX (mail exchange) records: validate email address php
$email = "user@example.com"; $domain = substr(strrchr($email, "@"), 1); if (filter_var($email, FILTER_VALIDATE_EMAIL) && checkdnsrr($domain, "MX")) echo "Valid email and domain has mail server"; else echo "Invalid email or domain has no MX records"; if ($validation['valid']) $success = "Email is valid
// Optional DNS check if ($checkDNS) $domain = substr(strrchr($email, "@"), 1); if (!checkdnsrr($domain, 'MX') && !checkdnsrr($domain, 'A')) return ['valid' => false, 'message' => 'Domain has no mail server']; It does not check if the domain actually exists