Unable to receive SMTP messages from outside the network.
Posted on 2005-03-12
We have a simple setup. One server set up as the domain controller, one firewall, and about 15 or so clients.
I am setting up a new Windows 2003 server running Exchange 2003. I am not able to receive Emails from outside domains, but I can send them to outside domains and to others within the organization.
We have a firewall that is running ISA 2000. Our ISP has properly configured the MX records and is pointing the mail.REGISTEREDDOMAIN.org to the firewall. I am able to ping our mail.REGISTEREDDOMAIN.org domain, and have checked the mx records using nslookup. I think eveything on the ISP end is fine since everything was working with our old server (which was running Exchange 5.5). The old server is no longer part of the network. I've moved the user data files on the old over to the new server and have EXmerged the old 5.5 mailboxes to pst files to be imported into the new exchange box.
I've added the mx record to the server's DNS (SERVERNAME.DOMAINNAME.ORG).
I think this is a routing issue, but I'm not sure where to go from here. I noticed on the old server that IMS was rerouting incoming SMTP messages (through IMS) to REGISTEREDDOMAIN.ORG. How do I acheive this same functionality with the new server? Or is there a setting on the firewall running ISA that needs to redirect to the server?
Thanks in advance for all of your help! This website has saved my life more than once, I hope you can do it again!