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Identifying Source of SPAM

I was having a problem with mail queues on my Exchange server filling up with unidentified mail.  By increasing the logging on my Exchange server, I was able to identify which host is sending the mail.  What would be the best way to go about identifying what on that host is sending the mail?
1 Solution
you can try http://www.mxtoolbox.com it is a blacklist site but give you alot of information.  that is a good place to start.  and this site will give you some information on the site.  http://www.networksolutions.com/whois/index.jsp
gtkdwAuthor Commented:
To clarify - the host that is pushing the mail to my Exchange server is on my network.  I am looking for the best way to identify what on that host is sending the mail.
Alan HardistyCo-OwnerCommented:
You can download and install Wireshark and then run a network trace to see what is happening on your network and then filter port 25 traffic and see where the traffic is coming from.


Are you sure the host is internal and not an external host using your server as an authenticated relay?  That is the more usual source of spam and my article might help you with this:


Suliman Abu KharroubIT Consultant Commented:
Check the machine for viruses.

also you can check for any process sending emails on port 25:
-Close outlook and any mail clients apps.
-run  " netstat -a -n -o"
-search for Foreign ports 25
-identify the process on the task manager..
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