Probably a simple Shorewall question - forward new email traffic to 2nd server
We purchased another company that has their own domain and email server (Exchange). The server sits inside our network now but I need to accept email traffic for their domain through my firewall and forward it to an internal email server for a few weeks while we transition users off of that server. Essentially I need to run a second email server inside our network EXCEPT that this particular email server will only be getting traffic from 5 specific IP addresses since they use a service to filter their email.
Is it wise to allow all traffic from those specific IP addresses through and forward them to the Exchange server IP address? I know the company and trust them. Also will my plan work? Most of all how do I configure Shorewall to do this forwarding? Thanks in advance.
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