Question : NDR 550 5.1.4 in Exchange 2007

when trying to send an email to one of my distrib. grps, I receive the following NDR msg:

There is a problem with the recipient's e-mail system. More than one user has this e-mail address. The recipient's system administrator will have to fix this. Microsoft Exchange will not try to redeliver this message for you. Please provide the following diagnostic text to your system administrator and then try resending the message after the problem has been resolved.

#550 5.1.4 RESOLVER.ADR.Ambiguous; ambiguous address ##

Now, obviously the error in question states there's a duplicate email address here, but when searching AD, I can't find it. How can I search to find the conflict...maybe in the EM Shell...or anywhere...I'm open? Found this site, but not too detailed in it's solution. If anyone can clarify what he specifically done here, that would be great (http://jasonhuitt.com/blog/post/550-514-RESOLVERADRAmbiguous3b-ambiguous-address.aspx).

Thanks!

Answer : NDR 550 5.1.4 in Exchange 2007

Take a look at this: http://flaphead.dns2go.com/archive/2007/11/09/550-5-1-4-resolver-adr-ambiguous-ambiguous-address.aspx

tested and worked for me.
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