Exchange 03: Message stuck in categorizer

Our office uses exchange 2003, when I try to send an email from each of my 3 outside accounts (GMail, Hotmail, and InsightBB-ISP) All but the insightbb comes through.  All messages from insightbb, not just mine, are getting "stuck" in the "message submitted to categorizer" stage.  I have tried all other tasks related to this, everything I have found using Google at least.

I have checked my dns records, I only have one mail server, I do not have a software spam filter (we use an appliance before the mail server) I can get almost every other email from outside.
Snyper82Asked:
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MesthaConnect With a Mentor Commented:
Categoriser is where AV and antispam does its thing, therefore that is where i would be looking at for the problem.

Simon.
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Snyper82Author Commented:
We do use Trend micro as a software AV.  But it seems that there isn't an email scanner, only scans machines for viruses.  At least I can't find it if there is and email AV filter.  

A little background - I have been hired in to admin an existing system, very little info is available as to what is here or involved in the system.  
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MesthaConnect With a Mentor Commented:
You are going to have to go through the system to see how it is configured. All I can tell you is what I have already said. Categoriser can also be the place where restrictions on messages are applied, such as automatic forwarding to the internet blocked. However incoming messages wouldn't be affected by that.
If it was something like a blacklist blocking the messages then it would occur later on.
I presume that the sending account didn't get an NDR?

Simon.
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Snyper82Author Commented:
I guess I was just overlooking something, it seems that the AV (I didn't realize scanned email) had these domains blacklisteed.  Thank you very much!
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