I finally set up our pix 515 and re IPed our network. We have an Exchange Server (5.5) running on a NT 4.0 PDC. It HAD a public IP address 209.71.x.x. Now it has a private 192.168.1.x address. Accessing the mail server from the outside through the firewall works great. There is a translation from 209.71.x.x to the 192.168.1.x, and I added some static ports to make it work (I know it isn't the best securitywise, but it works for now)
The problem is, the internal clients that are on the same subnet as the mail server (192.168.1.x subnet) are having a hard time opening up their mail using Outlook 97. It hangs for about a minute and finally opens, where it use to just pop open when they use to be on the old 209.71.x.x subnet with the mail server.
When I ping the e-mail server's fqdn or computer name from the internal clients, it tries to resolve the name to the old 209.71.x.x address.
I don't have an internal DNS server or hosts files on the clients, but I am running a WINS server.
I think I have narrowed the problem down to a name resolution problem, but how can I tell the internal client PC's that the mail server is now at 192.168.1.x