Microsoft KB Archive/251955

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Microsoft Exchange Connector for Lotus/Domino appends @SMTP@<Connector_for_Lotus_Notes_Domain> to the From address when receiving Internet mail for a Notes user

Article ID: 251955

Article Last Modified on 10/25/2007


  • Microsoft Exchange Server 2003 Enterprise Edition
  • Microsoft Exchange Server 2003 Standard Edition
  • Microsoft Exchange 2000 Server Standard Edition
  • Microsoft Exchange Server 5.5 Standard Edition

This article was previously published under Q251955

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


When you set up the Microsoft Exchange Connector for Lotus Notes in an environment in which Microsoft Exchange Server 2003, Microsoft Exchange 2000 Server, or Microsoft Exchange Server 5.5 sends and receives all of the Internet mail, the Exchange Notes Connector may append the From line with @SMTP@Exchange (or with the name that you chose for your Exchange environment as a foreign domain in Lotus Notes).


This problem can occur because earlier versions of the Exchange Notes Connector need to append the address to properly resolve the address and route the message to the Internet by means of Simple Mail Transfer Protocol (SMTP). The Exchange version of the Exchange Notes Connector can determine an Internet address by the way that the address is formed; therefore, this appendage is no longer necessary.


To resolve this problem, verify that you are routing all outbound SMTP mail to the Exchange server by another foreign domain document, as described in the Exchange Help (the default Help location is Systemroot\Program files\Exchsrvr\Bin\Exadmin.chm), and then disable the address appending by adding the MEXOUT_INCAPSULATESMTP registry value.

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.

NOTE: The information about Registry Editor in this article applies to Microsoft Windows NT and Microsoft Windows 2000.

To add the MEXOUT_INCAPSULATESMTP registry value:

  1. Start Regedt32.exe.
  2. Locate the following registry key:


  3. On the Edit menu, click Add Value, in the Value Name box type MEXOUT_INCAPSULATESMTP, and then in the Data Type box type REG_SZ.
  4. When you are prompted for the string, type FALSE.
  5. Restart the Exchange Notes Connector service.


Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

Keywords: kbbug kbnofix KB251955