Message Deferred by categorizer

Hi,

We experienced queueing of messages and error is saying "message deferred by categorizer".

It resume to normal when we restarted transport service.

Is this related to Anti-Virus or Active Directory.?

Regards,

Jhun

June 24th, 2013 12:18pm

Hello,

The categorizer performs recipient resolution before routing. Th issue may be related to recipient resolution.

Recipient Resolution

http://technet.microsoft.com/en-us/library/bb430743(v=exchg.150).aspx

I suggest you use message tracking to trace your messages.

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June 25th, 2013 6:36am

Just bumping this as I had the same issue. Took me a number of issues to track this down to a bad transport agent. I wrote up my findings here: http://tecfused.com/2015/06/15/message-deferred-by-categorizer-agent/
June 17th, 2015 8:29pm

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