RRAS port 25

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Hi
Our IP address has been blacklisted.
I would like to block smtp traffic from the local PC's from getting out of
the network, with the exception of the mail servers of course. How exactly
do I do this in RRAS ?
We use SBS 2003 with exchange. IP range is 192.168.16.0. At the moment the
only rule that is set on NAT is on the internet NIC Outbound traffice Allow
All with exception 192.168.16.0 - Any Any
And is there a way to see which PC is causing the spam

Thanks in advance


.

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