I am looking for a definitive solution to this one.

I must be overlooking something fundamental here but can this be done on a Vigor 2930 ?

I need to block all outbound port 25 traffic from the LAN apart from the Exchange server's internal LAN IP address.

This is a piece of cake in every Linux distribution I would normally use as a firewall/gateway - like I say, I must be overlooking something fundamental.


Anyone ?

Sure it can:

Firewall -> Filter -> Data-Filter

Set up your rules here.

I think the firewalling functionality of Draytek devices is top dollar.