Duplicate SMTP addresses causing NDR’s

When programtically writing contacts to a directory the application you are using may not have a mechanism in place that automatically checks to see if an smtp address already exists. Duplicate smtp addresses will generate event id’s and will cause NDR’s as Exchange will drop a message when more than one object has the same SMTP address.

Event Type: Error Event Source: MSExchangeTransport Event Category: (9) Event ID: 9217 Date:  7/6/2012 Time:  2:02:18 PM User:  N/A Computer: mailserver.domain.com Description: More than one Active Directory object is configured with the recipient address smtpaddress@domain.com. Messages to this recipient will be deferred until the configuration is corrected in Active Directory.

To easily locate the objects that contain a particular smtp address you can do the following in ADUC under Custom Search -> Advanced





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Author: JA

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