I need to construct some type of relay server that will receive SMTP
requests on port 17 (or any port other than 25) and relay mail to my current
Exchange Server host on port 25 for processing.
I was thinking of building another Exchange server that is to set up as a
mail relay that accepts SMTP requests on port 17 and relays them to another
mail server on port 25. But how can I configure Exchange to do this? If I
change the SMTP port in the services file, then it will receive and relay on
17 which is not acceptable.
Basically, how do I execute a port switching relay?