Microsoft KB Archive/143375

= Multiple messages received by Exchange client =

Article ID: 143375

Article Last Modified on 10/26/2006

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APPLIES TO


 * Microsoft Exchange Server 4.0 Standard Edition
 * Microsoft Exchange Server 5.5 Standard Edition
 * Microsoft Exchange Client 5.5
 * Microsoft Exchange Client 5.0
 * Microsoft Exchange Client 4.0
 * Microsoft Exchange Client 5.0

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This article was previously published under Q143375



SUMMARY
There are instances when an Exchange Mail client receives multiple copies of the same message that is sent from the Internet via the Internet Mail Connector (IMC) or by a Microsoft Mail 3.x client via the Microsoft Mail Connector.



MORE INFORMATION
This behavior occurs if the Exchange recipient belongs to multiple Distribution Lists (DL). For instance, if user1 belongs to Distribution List 1 (DL1) and to Distribution List 2 (DL2) and an Internet or Microsoft Mail 3.x client sends to both DLs, the Exchange client receives two copies of the same message. If DL2 is a member of DL1, then the Exchange recipient receives three messages.

This behavior is by design. It is an X.400 feature. Exchange Server tries to eliminate duplicates, but for mail coming from external sources, the information that is required to accomplish the task is not available.

Additional query words: XADM ms mail mta message transfer agent

Keywords: kbusage KB143375

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