420 4.2.0 RESOLVER.ADR.Ambiguous; ambiguous address

We  are in the middle of a migration from Exchange 2003 to Exchange 2010.  I see there that there are over 100 items in the submission queue for Exchange 2010.  All of the items are from the same address (exchange_server_name-IS@domain.com) to the same recipient address (_5@domain.com).  All of the messages have the same error:

Identity: CAS01\Submission\257062
Subject: Folder Content
Internet Message ID: <012033945802AC4AB8DF73C9A4EB19639B9657@echange_server_name.domain.com>
From Address: echange_server_name-IS@domain.com
Status: Retry
Size (KB): 42
Message Source Name: SMTP:Default CAS01
Source IP: x.x.x.x
SCL: -1
Date Received: 4/25/2011 4:03:09 PM
Expiration Time: 4/27/2011 4:03:09 PM
Last Error: 420 4.2.0 RESOLVER.ADR.Ambiguous; ambiguous address
Queue ID: CAS01\Submission
Recipients:_5@domain.com

I went through the following links:

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

http://www.experts-exchange.com/Software/Server_Software/Email_Servers/Exchange/Q_23445951.html

When I do an LDAP search for the email recipient address (_5@domain.com) it doesn't come up in the search.  I confirmed my syntax was correct by finding an account that I know does exist.

I did find SMTP addresses on the System mailboxes in the storage groups of the Exchange 2003 server that had similar addresses like _2@domain.com  & _9@domain.com, so I'm wondering if the address _5@domain.com is a remnant.

Any help would be appreciated.




sillzAsked:
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sillzConnect With a Mentor Author Commented:
We found the duplicate using the query in my original posting.  We just needed to make sure that we were searching across multiple domains
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Tony JLead Technical ArchitectCommented:
Slightly different number in the error, but the remainder of the code is the same (ambiguous address) plus just gone through a migration:

http://www.howexchangeworks.com/2010/09/550-514-resolveradrambiguous-ambiguous.html
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sillzAuthor Commented:
I saw those docs too.  I tried searching for the recipient address, but it doesn't seem to exist as a user or contact.
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sillzAuthor Commented:
we juts needed to search across our multiple domains
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sillzAuthor Commented:
We resolved our own problem by running the query in my original posting.  We had to run the query in multiple domains to find the duplicates.  
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