'Messages with an unreachable destination' queue holds messages

[This topic is intended to address a specific issue called out by the Exchange Server Analyzer Tool. You should apply it only to systems that have had the Exchange Server Analyzer Tool run against them and are experiencing that specific issue. The Exchange Server Analyzer Tool, available as a free download, remotely collects configuration data from each server in the topology and automatically analyzes the data. The resulting report details important configuration issues, potential problems, and nondefault product settings. By following these recommendations, you can achieve better performance, scalability, reliability, and uptime. For more information about the tool or to download the latest versions, see "Microsoft Exchange Analyzers" at http://go.microsoft.com/fwlink/?linkid=34707.]  

Topic Last Modified: 2006-10-04

The Microsoft® Exchange Server Analyzer Tool queries the ExchangeLink Microsoft Windows® Management Instrumentation (WMI) class to determine the value of the TypeCurrentlyUnreachable, LinkName, and NumberofMessages properties for the Simple Mail Transfer Protocol (SMTP) queues on a server.

The TypeCurrentlyUnreachable property, when True, specifies that the link (Exchange queue) holds messages for destinations that currently cannot be reached.

The LinkName property specifies the name of the link.

The NumberOfMessages property specifies the number of messages that are waiting for transmission across the link.

If the Exchange Server Analyzer determines that the Messages with an unreachable destination SMTP queue contains any messages, the Exchange Server Analyzer displays an error.

This error indicates that there are messages in the queue that cannot reach the intended destination server. For example, Exchange cannot determine a route or a connector to the final destination. Alternatively, all available routes or connectors are marked as down.

To address this error, take the following steps:

  • Determine whether the messages in the Messages with an unreachable destination queue are legitimate.

  • Review the error guidance and links provided by the Exchange Server Analyzer.

  • Follow the guidance in "For More Information" later in this topic.

For More Information

For more information about how to troubleshoot SMTP queues, see the following Exchange resources: