getmxrr / checkdnsrr & firewall ports

[gushy]

anybody know what ports I'd need open on a firewall for getmxrr / checkdnsrr?

We've just moved offices and the network admins have gone ultra-secure in the new building.

I've had them open the whois port (43/tcp) to my servers as I assumed getmxrr and checkdnsrr would use whois, but that hasn't worked. 🙁

I'm still getting a false return when checking valid email addresses (that worked before we moved).

Any ideas anyone?

[LordShryku]

MX records are specific to mail, so I'd assume they'd run on the mail ports. With checkdnsrr, you can specify a type. Considering your whois port is open, try it with a type A query to see if it returns...

[gushy]

unfortunately that didn't work. 🙁

I have been using ANY rather than A.

The function which I use is the function submitted by paul at start dot co dot uk on the getmxrr function page at php.net

function emailIsValid($email)
{       

    if (eregi("^[0-9a-z]([-_.]?[0-9a-z])*@[0-9a-z]([-.]?[0-9a-z])*\\.[a-z]{2,4}$", $email, $check)) {
        $host = substr(strstr($check[0], '@'), 1).".";
        if ( getmxrr($host, $validate_email_temp)) {
            return TRUE;
        }           

        // THIS WILL CATCH DNSs THAT ARE NOT MX.
        if(checkdnsrr($host,"ANY")){
            return TRUE;
        }
    }
    return FALSE;
}

Like I say it's worked fine up until now. I suppose what I could do is see if I can build a firewall on the box and log any outgoing attempts, but that seems a long way around the problem.