[NTLUG:Discuss] IPChains rules (kernel 2.2) to limit smtp port 25 access

[Bug Hunter]

  I need to limit smtp port 25 access to servers on our network.  We have
a class c network with smtp servers, and a firewall. The users behind the
firewall are going out to the internet and bouncing off of servers in
china, etc.

 I want to limit them to our smtp server so that we can more easily track
them down and grind them into a pulp and stomp them and ....... shudder.


  The firewall is a smoothwall firewall.  I have customized it, but I'm
not sure of the rules that would limit the smtp access.


  The users may be dialing in, and they may be coming in off of other
machines not easily traceable.

bug