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I'm about to move my current 800+ SmarterMail user base to a new server which is behind a Cisco firewall and a slightly different IP address setup. I've noticed that the server itself can't see the external IP address that is used to access it but rather its internal one that the external traffic is sent to. Is this likely to cause a problem when I move everyone across? I've setup SmarterMail on it and can access it via webmail no problem.
The IP address setup is something like this:
I've setup the IP address bindings to 172.25.247.133 and the hostings to be external IP.