Thanks Ryan -
I will try this on Monday afternoon. I just got back from office trying other options to get it to work but had no luck.
I did however change the default gateway on the Exchange server to point to the ISA server. But I never cleared out the Smart host...will try that.
Also I ran "netstat" on the ISA server to see which ports were in use and it seemed that SMTP:25 was not listed?? It did at one point list exchange and other ports in the 3000 range?? Not sure what this ment but I thought that it should be using port 25.
Let me fill in some more details about the setup. Exchange is the only mail server, as well as ISA is the only internet gateway.
Exchange has no connectors configured. On the first tab on SMTP virtual server I have the IP address of the Exchange server selected and use port 25. No mail relay setup. On last tab (?) smart host pointed to the ISA (internal NIC) - which I will remove that IP (blank). DNS is configured to use the DNS servers of my ISP. On ISA I have ran the Secure Mail Server wizard and opened the TCP port 53 for DNS querries.
I have a router from Centurytel that connects to the firewall (ISA or Gatekeeper). I was wondering about the external NIC of the ISA server is say 192.168.0.11 this is not however that static IP address issued by Centurytel say 64.x.x.x So when I bind the external NIC to 192.x.x.x
in the Mail Wizard is this causing problems?
What is strange is that I can disconnect the ISA server and connect the "Gatekeeper" computer to the DSL and can send/rec. Internet email all day. The only change that I make is setting the Smart Host on Exchange to point to the Gatekeeper instead of ISA.
Thanks Ryan for all your help,