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Weird Exchange Problem?

We recently acquired another company with their own Exchange server.  We have setup mail accounts on our server with our domain name but the users also have their old mail addresses handy.  What is happening is when someone sends an email to their new accounts from inside our organization, the mail goes through.  When they send an email to the users old mail address (and their Exchange server is still up and running BTW) the message bounces back as below...

Delivery has failed to these recipients or distribution lists:

Friedrich Nolting
The recipient's e-mail address was not found in the recipient's e-mail system. Microsoft Exchange will not try to redeliver this message for you. Please check the e-mail address and try resending this message, or provide the following diagnostic text to your system administrator.


Sent by Microsoft Exchange Server 2007

Diagnostic information for administrators:

Generating server: AISHQEXC01V.aiscorp.local

#550 5.1.1 RESOLVER.ADR.ExRecipNotFound; not found ##

Original message headers:

Received: from AISHQEXC01V.aiscorp.local ([]) by aishqexc01v
 ([]) with mapi; Wed, 16 Jan 2013 13:08:58 -0500
Content-Type: application/ms-tnef; name="winmail.dat"
Content-Transfer-Encoding: binary
From: Stephan Laurie <SLaurie@aiscorp.com>
To: Friedrich Nolting <fnolting@aiscorp.com>
CC: Friedrich Nolting
Date: Wed, 16 Jan 2013 13:08:57 -0500
Subject: Testing
Thread-Topic: Testing
Thread-Index: Ac30FH7UU9+khLICR4ub2E5Sh39jVg==
Message-ID: <5BDC64E5332192478643F49D816ADC2A0115A8718830@aishqexc01v>
Accept-Language: en-US
Content-Language: en-US
X-MS-TNEF-Correlator: <5BDC64E5332192478643F49D816ADC2A0115A8718830@aishqexc01v>
MIME-Version: 1.0

I have also clicked on the To: field in Outlook, and the user is showing up with the old domain mail address.  The really weird thing I can think of that is causing this is that the person in question was put in to Exchange as a contact at one point in time.
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1 Solution
Manpreet SIngh KhatraSolutions Architect, Project LeadCommented:
Create a X500 email address for this user which will take care of the issue


WOuld be something like
X500: AISCORP\First Administrative Group\Recipients\fnolting@aiscorp.com

- Rancy
AegisIT1Author Commented:
Would the X500 record need to point to their old address instead? When we send to aiscorp.com, its fine. When we send to their old mail address, it bounces.
Manpreet SIngh KhatraSolutions Architect, Project LeadCommented:
Ideally its something like the Alias at the end but whats mentioned has to be in the X500 .... however add this and if it doesnt resolve we can try the other as well

- Rancy
If it is single user issue, ask Stephen to delete the auto address cache of Friedrich  from his outlook and ask Stephen to pull the email address from Global Address Book.
AegisIT1Author Commented:
Excellent advice and quick as well!
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