XFOR: Mail Queues Grow And Messages Are Not Deleted From Queue (185872)

RESOLUTION

To resolve this problem, obtain the following fix by contacting Microsoft Product Support Services.

The fixed Smtpsvc.dll should have the following version number: WARNING: Using Registry Editor incorrectly can cause serious problems that may require you to reinstall your operating system. Microsoft cannot guarantee that problems resulting from the incorrect use of Registry Editor can be solved. Use Registry Editor at your own risk.

For information about how to edit the registry, view the "Changing Keys And Values" Help topic in Registry Editor (Regedit.exe) or the "Add and Delete Information in the Registry" and "Edit Registry Data" Help topics in Regedt32.exe. Note that you should back up the registry before you edit it. If you are running Windows NT, you should also update your Emergency Repair Disk (ERD).

To install this fix, perform the following steps:

1. Stop SMTPSVC by performing one of the following:
   
   
   • From a command prompt run the following:

     net stop SMTPSVC

     -or-
   • Select the SMTP service in Microsoft Internet Service Manager, click Properties on the menu bar, and then choose Stop Service.
2. Replace Smtpsvc.dll in your <SystemRoot>\System32\Inetsrv directory with the version of Smtpsvc.dll included in this fix.
3. Add the following registry keys to HKLM\SYSTEM\CCS\Services\SmtpSvc\Parameters as DWORD values:

   LocalQueueThreads: 1
   RemoteQueueThreads: 4

   NOTE: The maximum number of threads per queue is 64.
4. Start SMTPSVC by performing one of the following:
   
   
   • From a command prompt run the following:

     net start SMTPSVC

     -or-
   • Select the SMTP service in Microsoft Internet Service Manager, click Properties on the menu bar, and then choose Start Service.

After you install this fix, you will need to test the computer with the threads set at various levels. The ideal number of threads depends on your hardware and your goals. Please note that on a single processor computer, setting the threads beyond their defaults may cause a loss of performance; more threads does not necessarily mean more performance.