And what is the dummy record? If it's not valid (i.e. and unroutable IP such as the 10,192, 172 blocks, then it might get routed back to the client's internal network. If it's a public IP it can be worse. Say you route it to a dummy IP owned by you and there isn't anything on there and one day you add it and suddenly mail is being rejected there. Please don't tell me you use 127.0.0.1 as the invalid address...
I just say use an additional A record for a valid host. It's a lot less trouble, conforms to a valid working design and can be less troublesome if you run into the above situation. I think that a valid route is better than a questionable one to an MX server. > But because of the uptime of my 1st and 2nd mailservers and because of the > robustness of the mail-protocol I've set the highest MX-number to a > 'dummy' server so that mail is blocked if they only try that MX-number > (must be a spammer then). That way this kind of spam doesn't arrive at > all. > It's a matter of taste.. > Menno
