PHP: isValidMail

vaild_email.php

<?php

function isValidMail($mail) {
 
	if(!filter_var($mail, FILTER_VALIDATE_EMAIL))
		return FALSE;

	if(!checkdnsrr("gmail.com", "MX")) // if we have no internet access on the server
		return TRUE;
		
	list($username, $maildomain) = explode("@", $mail);
	if(checkdnsrr($maildomain, "MX"))
		return TRUE;

	return FALSE;
}


var_dump(isValidMail("[email protected]"));
var_dump(isValidMail("[email protected]"));
var_dump(isValidMail("dfdsfs@"));