Emails Stuck In Categorizor Queue

AIS Monitoring Platform has discovered emails Stuck in Categorizor Queue. The SMTP Server\Categorizer Queue Length counter indicates the number of messages in the Simple Mail Transfer Protocol (SMTP) Categorizer queue waiting for directory service attribute searches using global catalog servers. The categorizer performs the following core operations: 1. Resolves and validates all recipients. 2. Determines limits and restrictions for all recipients. 3. Expands distribution lists if that is required. 4. Determines whether the message is for local or remote delivery This error indicates that there may be problems with server or network performance, Directory Service Access (DSAccess), the Active Directory directory service, or outages with key servers in the Exchange Server organization. An increase in the Categorizer Queue Length counter may indicate a either a slow response or no response in consulting Active Directory or in handing off messages for local delivery or SMTP. Impact : This might cause delayed mail delivery.

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Last modified April 17, 2020