You must forgive me my persistence but I will exhaust this until I fully understand what to do.
That's OK. :)
Your reply makes a lot of sense but a couple of items are still confusing me.
I already have the list of ports required by IMAIL and I used these to setup the IP filtering under networking. The system worked fine.
We have No NAT and the IMAIL box has its own IP address as does the Firewall etc.
The firewall has an option to create additional ports with rules for incoming and outgoing traffic separately.
The main point which confuses me is what IP address to use for the imail server?
That's up to you and the firewall to determine. Once placed behind the firewall, you may be forced to use the IP of the firewall (if it uses NAT, and only has one IP that it handles), or it may be able to have its own IP.
If you type "ipconfig" from a command prompt, you should see the IP that has been given to the IMail server (which will happen automatically if you use DHCP).
Does it get an internal address or an outside address?
It could be either, depending on how the firewall works. If it has an internal IP, though, the MX record should contain the IP address of the firewall.
Also, do I have to alter my DNS entry if the mail server moves behind the firewall?
Normally, that should only be necessary if both [1] the IP address of the mailserver changes, and [2] the IP address of mailserver is a private (internal) IP.
-Scott
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