But what incoming ports do I need to open? It seems to come in on 2400 and upward. Is there a known range?
Well, as far as new connections go, you don't need any inbound ports open at all.
Razor does the same thing a web client does.. it uses a random port for the local port that is >1024 and just assigned by the OS to whatever is convenient at the time. However, you don't need to wide open these ports as you will only get packets from already established tcp connections on these ports, and the remote port will be one of the documented ports.
The razor server will never initiate a tcp connection to your machine on any port (ie: syn with no ack).
Rough ideas for firewalls would be:
allow out tcp my_mailserver port 1024-65535 TO anywhere port 7 allow in tcp anywhere port 7 TO my_mailserver port 1024-65535 flags:ack
Note that if your firewall is stateful, it can do true "established" determination and you can use that instead of requiring the ack bit to be set to determine established or not.
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