[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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