Intermittent NDR in Application Event log

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Microsoft Exchange
Hi, My problem is w/ Exchange 2003 running on Windows Server Standard 2003. I'm having messages refused with error code 5.4.6. I've looked this up and it is supposedly caused by 2 contacts or users having the same email address. I am sure that this condition does not exist. I have searched my AD several times for this condition and have not found anything. The strange thing is that it seems to affect certain individuals more than others. BTW, this is only happening with external messages being delivered to our server. I sent myself a message from my home account on Sunday and received this error message. Today (Monday) I had my wife send me a message from my home account & it was delivered, however, I did restart the mail server this morning. One employee still has this problem even after the restart. This problem is driving me nuts! If any of you have ever experienced this sort of thing, I would appreciate any help you could give me. Let me know if you need any additional information. Thanks in advance, Matt
ASKED: June 26, 2006  1:18 PM
UPDATED: June 27, 2006  6:43 AM

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How many DC’s/GC’s do you have, there is the possibility you have “lingering objects” somewhere within AD, if you don’t have a large number of dc’s/gc’s then you can use LDP from the resource kit to search AD for the attributes e.g. SMTP address or X400 address if used etc, to find the objects that have the same attributes causing the error indicating one or more recipients have the same email address. Once located you can change the duplicate attribute on one of the accounts to remove the conflict.

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