You probably also don't need to unfirewall 25 - there's no need for anyone to connect from the outside to your SMTP installation. All that's required is for UBB to connect to port 25 (which usually happens from within the firewall on both ends anyway) and then for the SMTP server to connect out to wherever the email's going (on port 25).
So port 25 outbound yes, inbound, unlikely (at least not specifically for the UBB).
Graeme
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