How to track a cn with admanager

How to track a cn with admanager

Hi,
 
In opmanager we get a message:

ID=9646 Source=MSExchangeIS Type=1 Message=Mapi session "/o=tralala/ou=Exchange Administrative Group (FYDIBOHF23SPDLT)/cn=Recipients/cn=7a7f8908-cf95a6cd-c1256ddd-39f4b2" exceeded the maximum of 250 objects of type "objtMessage".

 
I would track this cn with admanager but with the search function I cannot find any result.
 
Any idea if there is a way to know what this is?
 
Regards,
 
Dave

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