Something is adding emails to my Exchange queue

I have a Windows 2003 SBS server running Exchange 2003. I have AVG Business Edition AVG running on it and have scanned it thoroughly and found nothing. Yesterday it was blacklisted so I ran the Norton Power Eraser as advised and it found problems with three wow64 dll entries in the registry but said it couldn't cure them. When I searched the filesystems for the files it mentioned I could find no trace. So after a reboot and another AVG scan all appeared to be clear and I reset the blacklist entry. However, when I look at the Queue folder using Windows Explorer I see junk emails appearing that fail to send. I assume there are others that are being sent which is even more of a concern.
ClintonKAsked:
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Carol ChisholmCommented:
Find out if you are an open relay on one of these sites:

http://mxtoolbox.com/diagnostic.aspx

Change all your passwords.
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Ahmed786Commented:
May be below article written by Alan Hardisty in that forum can be helpful.

http://forums.msexchange.org/Exchange_queue_has_lot_of_spam_emails/m_1800529993/tm.htm
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Carol ChisholmCommented:
Forgot to add another open relay test
http://www.mailradar.com/openrelay/

But MXtoolbox is a good one
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ClintonKAuthor Commented:
Just tried MXToolbox and it says there is no open relay. I'll work through Alan Hardisty's doc.
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Carol ChisholmCommented:
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Carol ChisholmCommented:
And make sure you check your passwords...
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ClintonKAuthor Commented:
Followed Alan's document to address a non-delivery attack which has now cured the problem. Thanks Alan and thanks to Ahmed786 for pointing me in the right direction.
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Ahmed786Commented:
Always Welcome.
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