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Trying to find the source of SPAM

Last Modified: 2012-06-27
My Exchange 2003 server outbound queues are loading up with SPAM.  Luckily, all email goes through our Barracuda, so everything got rate controlled to stop most of the email from leaving. I have the server tarpitted, but it looks like the SPAM is coming from an outside server relaying through mine. Here is a sample of the logs:

# Date      Time      client-ip      Client-hostname      Partner-Name      Server-hostname
5/15/2011      20:41:51 GMT      ESX20-1867      -      
5/15/2011      20:41:51 GMT      ESX20-1867      -      
5/15/2011      20:41:51 GMT      ESX20-1867      -      
5/15/2011      20:41:51 GMT      ESX20-1867      -      
5/15/2011      20:41:51 GMT      ESX20-1867      -      
5/15/2011      20:41:51 GMT      ESX20-1867      -      

When I try to telnet into the Exchange server and send an email it shows that relaying cannot happen. What am I missing?
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