Hey Drewbles
Well here is the topology if you want it
Billion ADSL (internal IP of 10.xx.xx.xx) -> Cisco 1800 series Fe0 (10.xx.xx.xx).
Cisco 1800 series Fe4 (192.168.xx.xx) -> Switch - > Server (192.168.xx.xx).
The Billion has a static route to send all traffic to the Cisco on the 192 range. Conversely all traffic not destined for 192 range is routed out through the Billion.
The Mail Server I am using is the default for Mac OS X 10.4 which is Cyrus. Default and install. No custom changes.
I can telnet to 25 from the server itself and from within the internal network.
The ISP shows no ports blocked. Have reblocked and unblocked again to be sure.
The Billion has passthrough rules for the mail ports. The Billion also has VNC passthrough rules which currently work from internal and external sources.
The mail server can be telnet'd to from external sources.
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