The SMTP SecondsPerDSNPass registry value is non-default

[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]  

Topic Last Modified: 2005-11-18

The Microsoft® Exchange Server Analyzer Tool reads the following registry entry to determine the setting on the SecondsPerDSNPass registry value:

HKEY_LOCAL_MACHINE System\CurrentControlSet\Services\SMTPSvc\Queuing

If the Exchange Server Analyzer finds that the SecondsPerDSNPass key is present and not set to 10, the Exchange Server Analyzer displays a non-default configuration message.

This setting is used to optimize Delivery Status Notifications (DSNs) and specifies the number of seconds for each DSN processing pass. As soon as this threshold has been surpassed, DSN generation will be stopped and then restarted later. It is recommended that the default values be modified only after serious consideration. This specific setting should only be modified after consulting with Microsoft Support Services. The defaults were carefully selected for optimal performance in most environments. A general best practice is to address the root cause of the problem instead of modifying the queuing behavior on the Exchange server.

The Exchange Server Analyzer reports this configuration for informational purposes only. No action is required.