[Mimedefang] OT: control internal spam

-ray ray at ops.selu.edu
Tue May 3 18:05:42 EDT 2005


All,

We block port 25 at the firewall so all outgoing mail has to go out our 
gateway.  Occasionally a student will figure out they can make a few $$$
by relaying spam.  It doesn't happen often, but happened today and they 
managed to sneak out 2000 messages before we noticed.

Any ideas on how to combat this?  Obviously we have to allow SMTP for 
internal legit clients on our network.  Is SMTP AUTH the answer? Or pop 
before SMTP? (currently not using these).  Some kind of rate limiting per 
IP?  Just looking for any ideas...

ray
-- 
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Ray DeJean  				       	 http://www.r-a-y.org
Systems Engineer                    Southeastern Louisiana University
IBM Certified Specialist  	      AIX Administration, AIX Support
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