5.1.1 RESOLVER.ADR.ExRecipNotFound error

Can anyone help me with this issue?  An employee at "company"  tried to send an e-mail to an employee at "company2".  The e-mail bounced.  If you notice, the to line clearly shows the recipient as company2.  The error message said it couldn't find the user at company.  I manage both domains, and there is no trust between them, however, the DNS servers at company do look at the DNS servers at company2 (and vice-versa), as we have a p2p VPN connection between the two domains.

This didn't happen until recently, and this is relatively soon after we upgraded company from Exchange 2003 to Exchange 2010.

Any help would be appreciated.

Diagnostic information for administrators:
Generating server: WGIMEXCH2010.company.local
#550 5.1.1 RESOLVER.ADR.ExRecipNotFound; not found ##
Original message headers:
Received: from WGIMEXCH2010.company.local ([::1]) by
 WGIMEXCH2010.company.local ([::1]) with mapi; Tue, 27 Sep 2011
 12:43:15 -0500
Content-Type: application/ms-tnef; name="winmail.dat"
Content-Transfer-Encoding: binary
From: Wendy Employee <wendy@company.com>
To: 'Stu Employee' <stu@company2.com>
Subject: Volleyball
Thread-Topic: Volleyball
Thread-Index: Acx9PLbskjIZAA2ZTS6oQUbzdwl/BgAABO1Q
Date: Tue, 27 Sep 2011 12:43:01 -0500
Message-ID: <66522E5CC29F954E982DC9D703BF9E631312A3@WGIMEXCH2010.company.local>
Accept-Language: en-US
Content-Language: en-US
X-MS-TNEF-Correlator: <66522E5CC29F954E982DC9D703BF9E631312A3@WGIMEXCH2010.company.local>
MIME-Version: 1.0
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Craig_KiddooConnect With a Mentor Author Commented:
OK, since no one stepped up, I finally figured out a solution on my own.  

1. Create a new user profile in Outlook (it turns out this was a problem with the client, not the server)
2. Edit the old .nk2 file and remove the EX records pointing to old e-mail addresses (the SMTP records can stay)
3. Copy the old .nk2 file to be associated with the new profile.

Now all e-mail is delivered without any bouncebacks due to old contacts in the defunct 2003 server
This is happening for single user or for multiple users..?
Craig_KiddooAuthor Commented:
One user is having the issue at the moment, then she resent, and it went through as it should.  The user who sent the message used to be part of the company2 domain, however when she moved to company I created a new profile in Outlook for her new e-mail address.  The recipient has never had an e-mail address with company, always at company2.
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Ok so now what issue you are facing..
Craig_KiddooAuthor Commented:
Same issue, just because it is working now doesn't mean this won't come up again and again (I am trying to be proactive rather than reactive). There is a lot of e-mail between the two domains in question and I need to ensure that mail gets through when sent.  If this was a glitch, then why?  I didn't change anything between the first message sent unsuccessfully and the second that went through.  I want to make sure there isn't something in the server that would cause this issue to recur in the future.
Craig_KiddooAuthor Commented:
The issue has come back, and it seems to be affecting recipients who were set up in the old 2003 exchange server before we introduced the new 2010 server.  The old server died about 2 days after the data was transferred (how's that for timing), so I can't follow the instructions to completely remove it.  The contact information it is trying to use appears to be coming from the old server.
Craig_KiddooAuthor Commented:
Didn't receive any responses that would fix the problem, figured out a solution on my own
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