Inbound Message Stops at Categorizer

Another "categorizer" question. Email coming from a single domain to several people/accounts in Exchange 2003. Message stops in submitted to categorizer step/phase. Exchange configured to allow anything from this domain in. Trend Micro spam/virus filter similarly configured and searching messages in spam/virus filter yields no messages from this domain. Not in Badmail, either. Email still gets stopped in this step. Suggestions for next step to resolve?
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Pull out the AV/Antispam.
That is the usual cause of messages stopping at that point.
You have to remove it - disabling it is not enough as the hooks stay in Exchange.


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