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How to tell which client computer inside my LAN is sending out spam emails?

Castlewood
Castlewood asked
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Last Modified: 2013-11-22
We suspect one of our client computers inside our LAN is SOMETIMES sending out spam emails. From time to time we have external users (such as auditors, sales persons, staff members from our other divisions) connecting to our LAN. Instead of virus-scanning one by one, I want to know if there is any way (like monitoring tools) to tell which computer is sending spam emails.  
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techzter is right.  that is a best practice and if you have some logging on your firewall then you can see what machines are trying to broadcast out spam on port 25.
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Sorry for the duplicate info shadow. I was typing while you posted.
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