We are currently setting up a test network with a firewall, DMZ, and email. After many hours of research we have decided to leave the email server inside the internal network instead of placing the server in the DMZ due to the vast number of ports that must be left open to use Exchange in the DMZ (MS Knowledge Base Article 278339). We have decided to place a machine in the DMZ to act strictly as a SMTP forwarder and forward traffic strictly for port 25 to Exchange in the internal network. Every piece of information I have been able to find regarding fowarders points to using a Linux/Unix box which we would rather not use at this time due to support reasons. Does anyone know of a Windows-based fowarder that would fit out needs? Any additional tips would be appreciated.
