XFOR: Lotus Notes SMTP Looping through Internet Mail Service

ID: Q195055

The information in this article applies to:

Microsoft Exchange Server, version 5.5

SYMPTOMS

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 Server. A looping condition 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:


   Message cancelled because it was looping through the network [MAPI
   reason code:1 , MAPI diagnostic code 3]

CAUSE

The message recipient is recognized by Exchange Server as a Notes user, and the message is returned to Lotus Notes. Notes will recognize the SMTP address, and send it to the Internet Mail Service. Looping is detected, and the message is returned to the Notes sender as undeliverable.

WORKAROUND

This NDR is by design to prevent looping through the Exchange Notes Connector. However, if the functionality is required, a workaround can be implemented. You can disable looping detection in the Exchange Notes Connector by adding the following parameter to the Exchconn.ini file located in the Exchsrvr\Connect\Exchconn directory:

DISABLETRACECHECKEX=YES

This line must be added to both of the following sections:


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

After making this change, the Microsoft Exchange Connector for Lotus Notes service and the Microsoft Exchange Connectivity Controller must be restarted.

Keywords :
Version : WinNT:5.5
Platform : winnt
Issue type : kbprb