I'm currently using Exchange Server Enterprise. We've recently bought a new domain, and we are running an in house domain controller and mail server to host our web and e-mail services. However, Although I have both the SMTP and POP3 ports open and routed to the correct mail server, we are having issues sending/receiving mail. Messages won't go out, and when sent from a working e-mail address to our domain, they aren't delivered. Any ideas? Thanks in Advance...