使用MX检查进行电子邮件验证

Posted 2021-02-25

found this somewhere online...not the author, but works like a charm

function checkEmail($email) {
    if(preg_match("/^([a-zA-Z0-9])+([a-zA-Z0-9._-])*@([a-zA-Z0-9_-])+([a-zA-Z0-9._-]+)+$/", $email)){
        list($username,$domain)=split('@',$email);
        if(!checkdnsrr($domain,'MX')) {
            return false;
        }
        else {
            return true;
        }
    }
}