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How can I find how or what is using a proxy address on my Exchange 2010?

I made a black hole distribution group on my Exchange 2010 and when adding addresses it gives me the error: The proxy address "smtp:smith@whatever.com" is already being used by "Whatever.COM/EXEMPLOYEE/Sam Smith". Please choose another proxy address.
I have a single domain and Sam Smith does have that one address just as everyone has their own address (lastname@whatever.com. I have added other exemployee users without error but have a few like the one above that give me the error above. I'm still a bit green with Exchange so any help would be appreciated.
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Seth Simmons
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open active directory users and computers
right click on your domain and select find
in the find drop down list, change to custom search; click the advanced tab
in the ldap query field, type:

proxyaddresses=smtp:smith@whatever.com

click find now and it will show you the object that has that address
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ASKER

Seth,

That worked as it did find that user, I know where I put him but I was hoping that it would find another one so I could remove it from whatever user also had it. My goal is to add addresses to a black hole distribution list and when I do it errors out saying it's already being used. I can't remove it from the user as that is the only one he has, unless I'm just not understanding how to add people to a black hole distribution list. Any ideas?
objects that have a proxy address must be unique
what do you mean by black hole distribution list?  what are you trying to accomplish?
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That was easy and it worked! Just one more thing if you don't mind. Is there a way to check and see if the emails are in fact going to that distribution group?
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Sounds logical. Thanks for the quick help.
My goal was not stated in the question so the answer might not make sense with out it.