Lotus Notes SMTP looping through Internet Mail Service or SMTP Connector

This article applies to the Microsoft Exchange Connector for Lotus Notes, when Lotus Notes is configured to route all Simple Mail Transfer Protocol (SMTP) mail to the Exchange Server Internet Mail Service or the Exchange 2000 SMTP connector. Looping may occur when a Notes user sends a message to another Notes user's SMTP address; the sender may receive a non-delivery report (NDR) with the following syntax:

This issue can occur if Exchange Server or Exchange 2000 recognizes the message recipient as a Notes user. The Exchange server returns the message to Lotus Notes. Notes recognizes the SMTP address, and sends the message to the Internet Mail service or SMTP connector, as applicable. Looping is detected, and the message is returned to the Notes sender as undeliverable.

This NDR is generated by design to prevent looping through the Exchange Notes Connector. However, if the functionality is required, you can use a workaround. You can disable looping detection in the Exchange Notes Connector by adding the following parameter to the Exchconn.ini file that is located in the Program Files\Exchsrvr\Bin folder: This line must be added to both of the following sections:

   [LME-NOTES-MEXIN]
   [LME-NOTES-MEXOUT]
				

After you make this change, you must restart the Microsoft Exchange Connector for Lotus Notes service and the Microsoft Exchange Connectivity Controller.

Microsoft continues to update the tools that support interoperability among Lotus Domino R5 and Lotus Domino 6, Microsoft Exchange Server 2003, and Microsoft Windows Server 2003 Active Directory. The updated tools for Lotus Domino replace the following tools that are included with Exchange Server 2003 and with Microsoft Exchange Server 2003 Service Pack 2:

�	Exchange Connector for Lotus Notes
�	Calendar Connector for Lotus Notes
�	Migration Wizard for Lotus Notes

To obtain these tools and to obtain guidance and additional resources, visit the following Microsoft Web site: These updated tools provide additional functionality and address several issues that customers reported with earlier versions of the tools.