Microsoft KB Archive/254089

= Required registry setting when using SMTP Connector as a site connector to Exchange Server 5.5 =

Article ID: 254089

Article Last Modified on 2/26/2007

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APPLIES TO


 * Microsoft Exchange 2000 Server Standard Edition
 * Microsoft Exchange Server 5.5 Standard Edition

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This article was previously published under Q254089



Important This article contains information about modifying the registry. Before you modify the registry, make sure to back it up and make sure that you understand how to restore the registry if a problem occurs. For information about how to back up, restore, and edit the registry, click the following article number to view the article in the Microsoft Knowledge Base:

256986 Description of the Microsoft Windows Registry



SYMPTOMS
When you use the Exchange 2000 SMTP Connector as a site connector to an Exchange Server 5.5 site, you need a required registry setting for proper mail flow of system messages.



CAUSE
When sending a summary TNEF (S-TNEF) message, SMTP does not know that the message is binary MIME, and therefore tries to send the message using the DATA command instead of the BDAT command, as the BDAT command is not advertised on an Exchange Server 5.5 computer.



RESOLUTION
To resolve this problem, add the following key to the registry:

Warning If you use Registry Editor incorrectly, you may cause serious problems that may require you to reinstall your operating system. Microsoft cannot guarantee that you can solve problems that result from using Registry Editor incorrectly. Use Registry Editor at your own risk.  Start Registry Editor (Regedt32.exe). Locate the following key in the registry:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Exchange

 On the Edit menu, click Add Key, and then add the following registry key:

Key Name: StoreDriver

Class: (leave this blank)

 On the Edit menu, click Add Key, and then add the following registry key:

Key Name: Exchange

Class: (leave this blank)

 On the Edit menu, click Add Key, and then add the following registry key:

Key Name: 1

Class: (leave this blank)

Note After you add the keys in steps 3 through 5, you will be in the following key in the registry:

 On the Edit menu, click Add Value, and then add the following registry value:

Value Name: EnableTnef

Data Type: REG_DWORD

Data: 1

</li> Quit Registry Editor.</li></ol>

This registry setting forces the store driver to use TNEF instead of S-TNEF, and as a result, using the SMTP DATA command will not be a problem.

<div class="status_section">

STATUS
Microsoft has confirmed that this is a problem in Microsoft Exchange 2000 Server.

Additional query words: XCON

Keywords: kbbug kbfaq kbnofix KB254089

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