How to Fix: Duplicate messages are sent to an external recipient if the recipient is included in multiple distribution lists in an Exchange Server 2007 environment

Summary: Consider the following scenario. An Exchange 2007 user sends

a message to a parent distribution group that includes child distribution

groups. More than one child distribution group includes the same one-off recipient.

In this scenario, the message is delivered multiple times to the target system

of the one-off recipient. If the target system does not detect the message

duplication, the recipient receives multiple copies of the same message.

Note A one-off recipient is a recipient whose address is not in the

Active Directory.

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Manual Solutions

To resolve this problem, install Update 8 for Exchange 2007

Service Pack 1.

For more information about Update Rollup 8 for Exchange Server 2007 Service Pack 1, see the following Exchange Help topic: Description of Update Rollup 8 for Exchange Server 2007 Service Pack 1 For more information about how to obtain the latest Exchange service pack or update rollup, see the following Exchange Help topic:How to Obtain the Latest Service Pack or Update Rollup for Exchange 2007After you apply this fix, Exchange 2007 keeps

a configurable 100 KB * 16 byte cache for contact items and for distribution groups

when you expand distribution groups to reduce duplication.

Note You can configure the cache size to meet your actual

needs.

To change the default cache size manually, follow these steps:

Stop the Exchange Transport service on the Transport

server.

Locate the EdgeTransport.exe.config file. This file is

located in the following folder: <drive>

:\Program Files\Microsoft\Exchange Server\Bin

Add the following entry between the

<appSettings> element and the

</appSettings> element of the

EdgeTransport.exe.config file: <add key="MaxResolveRecipientCacheSize" value="xxxx" />

Restart the Transport service.

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