I want to FORCE users/servers on the network to redirect outgoing data sent on port 25 to another server (Internal mail server)
Not incoming mail
I'd still say that it's a messy and unecessarily complicated way of doing things. What I would tend to do is to tell the SMTP server on your network to forward all outgoing requests to the main mail server. What are you running as the MTA?
You can't when they are customer machines and customers using CGI's,php etc... it needs to be transparent to the network otherwise it would be a simple process
Thanks D