Here is the deal. We implemented an Exchange 2003 server over the weekend. We moved from POP mail to Exchange. Over the weekend, it seemed that incoming and outgoing mail was fine. Last night I realized all incoming and outgoing mail had stopped. I added a smarthost and now all outgoing mail stuck in the queue has sent, so that issue seems to be resolved. However, still no incoming mail. I have a Linksys Router with Port 25 forward to Mail server. Public IP address is: 188.8.131.52. I can telnet to port 25 from outside.
This is a very urgent issue, any help is much appreciated.