Topic Last Modified: 2006-04-20

The Microsoft® Exchange Server Analyzer Tool includes a performance data collection engine that is used to query performance counter objects on computers that are running Exchange 2000 Server or Exchange Server 2003. The performance data collection engine collects data from the Local Queue Length performance counter of the SMTP Server performance object to analyze performance data.

If the Exchange Server Analyzer determines that the Local Queue Length counter has exceeded the peak value of 1000 during the sample time slice, the Exchange Server Analyzer displays an error.

The SMTP Server\Local Queue Length counter indicates the number of messages in the Simple Mail Transfer Protocol (SMTP) queue for local delivery to the Microsoft Exchange Information Store service. SMTP local queue data (Mailroot directory) is temporarily held in the storage device while it is being processed by Exchange Server. This design prevents the data from being lost if the server fails. For example, when a destination server is unreachable, the messages that should be routed to that server will be stored on the local server queue directory until they can be delivered.

This error indicates a performance issue or outages on the server, because the server can no longer deliver the incoming mail in a timely manner. The following conditions can cause this delay:

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