Mail Server Problems

Hey Hey folks, Im a network engineer posing as a system administrator. Having some problems with my OSX Mail Server. Seems it is collecting all emails (sending and receiving) but not forwarding them on the receivers or to internal mail users inbox's. From an end user point of view, you can send email and receive email. But the recipiant never receives their mail and you never have new mail. I have checked the mail servers log '/var/log/mail.log' and have seen the following messages come up all the time Jul 12 15:49:43 localhost postfix/qmgr[1436]: B3A011412A33: from=, size=5024, nrcpt=1 (queue active) Jul 12 15:49:43 localhost postfix/qmgr[1436]: B3A011412A33: to=, relay=none, delay=5942, status=deferred (transport is unavailable) as well as this one. Jul 12 16:20:27 localhost postfix/qmgr[1436]: warning: connect to transport smtp-mailtransport: Connection refused I have tried the following so far: rebooting the server ran sudo SystemStarter start "MAILTRANSPORT" (force send the mail, also says how much mail is qued) ran sudo /usr/share/mailman/bin/mailmanctl -s start (restart mailman) But after all that I can only put it down to it looks like it's having trouble connecting to the mailtransport. Firewall settings are okay too. Any help would be great!!!