PHP eMail Verification

<?php

function emailVerify($email){
    $answer = false;
    if(filter_var($email, FILTER_VALIDATE_EMAIL)){
        // Next check the domain is real.
        $domain = end(explode("@", $email));
        if (checkdnsrr($domain), 'MX'){
            $answer = true;
        }
        else{
            if ((checkdnsrr($domain, 'A')) or (checkdnsrr($domain, 'AAAA')) or (checkdnsrr($domain, 'A6'))){
                $answer = true
            }
        }
    }
}