Validate Email Domain — Php

if (!$connection) return false;

function comprehensiveEmailValidation($email) // Remove any whitespace $email = trim($email); // Validate format if (!filter_var($email, FILTER_VALIDATE_EMAIL)) return ["valid" => false, "reason" => "Invalid email format"]; validate email domain php

return ["valid" => true, "reason" => "Email domain is valid"]; If getmxrr() isn't available (Windows servers): if (!$connection) return false

// Fallback: Check A record if no MX exists if (checkdnsrr($domain, "A")) return true; // Validate format if (!filter_var($email

// Connect to SMTP server $connection = @fsockopen($mx_host, 25, $errno, $errstr, 10);

if (isset($cache[$domain])) return $cache[$domain];