Exchange spamm e-mails

I have receive a 5 to 10  daily  e-mail messages with like 50 e-mail addresses cc same as my exchange server ****** @mydomain.com
The ***** is sgtd@mydomain.com  for example but sure each add in the cc is different****but @mydomain.com
I test relay for my e-mail is not open any help
I have exch 2007 sp1 under sbs2008
bugs-itAsked:
Who is Participating?
 
bugs-itAuthor Commented:
I activate smtp proxy from UTM netasq
now i am monitoring what is happening
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AustinComputerLabsCommented:
If it is not the server sending them, run Malwarebytes on all the client PCs to find out if one of them are sending it out.
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AmitIT ArchitectCommented:
Please paste the header information in below link
http://www.levinecentral.com/mail_parse/default.aspx

This will guide you from where it is coming. If possible post it here
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AustinComputerLabsCommented:
Does your domain registrar have an SPF record along with the MX record to make spoofing more difficult?

See info and how to here:

http://www.openspf.org/

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prashant_sawantCommented:
please go through this a very good article http://www.amset.info/exchange/spam-cleanup.asp... from the expert for spamming issue..
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bugs-itAuthor Commented:
after activate the anitspam option in netasq utm i solve the problem
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bugs-itAuthor Commented:
cos it slove my problem when i activate my ant-spam from utm and i able to monitor the messages
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