Microsoft KB Archive/231729

= XCON: DSUseCat Key and the Message Categorizer =

Article ID: 231729

Article Last Modified on 2/26/2007

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APPLIES TO


 * Microsoft Exchange 2000 Server Standard Edition

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This article was previously published under Q231729



SUMMARY
The Message Categorizer examines every message that come into an SMTP server and determines the course of action. The messages may be destined for the local store, a remote host by means of the message transfer agent (MTA), or a remote host by means of SMTP. The Categorizer also handles Distribution List (DL) expansion.

The DSUseCat registry key governs the state (enabled or disabled) of the Message Categorizer.



MORE INFORMATION
The Categorizer is shipped as part of the Microsoft Windows 2000 operating system. However, by default, the Message Categorizer is set to "disabled" when Windows 2000 is initially installed. When Microsoft Exchange 2000 Server is installed, the Categorizer is automatically set to "enabled."

Each virtual server instance has independent control of the Message Categorizer state. You can ascertain the value of the DSUseCat key in the metabase at the following location:

/smtpsvc/ /RoutingSources

The following is an example of a metabase dump of the RoutingSources for a virtual server instance. It shows the DSUSeCat key value to be 0xfffffff (Categorizer enabled) after Exchange 2000 is installed on the server:

 DSUseCAT              : [IS]    (DWORD)    0xffffffff={-1} DSFlags              : [IS]    (DWORD)    0xf={15} DSPort               : [S]     (DWORD)    0x0={0} DSType               : [IS]    (STRING)   "LDAP" Account              : [IS]    (STRING)   "Administrator" DSDomain             : [IS]    (STRING)   "TROLL" KeyType              : [IS]    (STRING)   "IIsSmtpRoutingSource" BindType             : [S]     (STRING)   "Simple" SchemaType           : [S]     (STRING)   "NT5Exchange"

Keywords: kbinfo KB231729

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