We have set up a Windows 2000 test network with a firewall, DMZ and a single domain. The DMZ will have a 10.0.x.x IP range and the domain will have a 192.168.x.x range. Our Exchange 2000 server will be in the domain and have a 192.168.x.x address. The firewall will only have incoming port 25 opened for email. At this time, the only machine that will be in the DMZ will be a mail forwarder.
Now the fun part…
We are looking for a windows based application to reside on the DMZ machine to act strictly as a mail forwarder. This application will perform no other function than to forward email from the DMZ 10.0.x.x machine into the Exchange 2000 server at the 192.168.x.x range. We know IIS can perform this function but would prefer not to tie up a server license just to perform this task. Any other available programs out there? We also do not want to go with a Unix/Linux machine at this time.