Don't get me wrong when this does work it works great I have not had a problem until now. All of a sudden OS X server (was 10.1.5) is rejecting all mail and not allowing me to login to a pop user outside my network (example checking my mail via my .mac additional mail account) stating the host can not be found. I can ping the mail.domain name and mail works fine inside the server. I have reformatted countless times and reinstalled fresh. everything else works fine. I have just tried to install OS X server 10.2 (for temp use only) which I got from a mate from the developers site to see if that works but still I can't get mail in from the outside world but I can send mail out. can anyone help me? Everthing is set to standard the only thing I have set is the domain names. Any help would be greatful.