/**
* Validate the domain of an email address by checking if the domain has a
* valid MX record.
*
* @link http://php.net/checkdnsrr not added to Windows until PHP 5.3.0
*
* @param string $email email address
* @return boolean
*/
public static function email_domain($email)
{
if (!Rules::not_empty($email)) {
return FALSE;
}
// Empty fields cause issues with checkdnsrr()
// Check if the email domain has a valid MX record
return (bool) checkdnsrr(preg_replace('/^[^@]++@/', '', $email), 'MX');
}
