I need some help. Our company decided to setup a frontend server in the DMZ to relay mail and filter it for spam but I have never done this before and I am not sure how to proceed.
Current setup is 1 Exchange 2003 server with about 180 mailboxes. It has ports 110 and 25 open thru our firewall to let mail in. It also does our spam filtering. The DNS entries point to it as the authorative server for our domains. How do I put another server in between and have it relay mail?
Do I need to setup Exhange on the DMZ server? Does the IIS Virtual SMTP server that it installed on it need SMTP relay configured?