exchange issue

Hi all hope you are well on this lovely day:-)

We had an issue on one of our office servers and as a temporary solution we routed emails through another of our offices servers.  
Ie changed mx records to point to our other servers IP and set up authorised domain on this server.

We then went to revert back to the old server - all seemed to work well as far as the new server sending and receiving emails except when sent from the office that we previously routed emails through.

When we send emails using outlook it picks up the email in the send to but comes up with not delivered address not found, even though if you send through another office or any other email account the email is fine.

We have deleted the accounts and mail boxes created previously where we temporarily routed the emails yet it still seems to be trying to send via these details and thus cant find that account or email address when trys to send.

Is there away to clear this and enable emails to be sent ok

server is sbs2011 exchange 2010

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censuraAuthor Commented:
this is error i get

Delivery has failed to these recipients or groups: (
The email address that you entered couldn't be found. Check the address and try resending the message. If the problem continues, please contact your helpdesk.

Diagnostic information for administrators:
Generating server: SBS2011.censura.local
#550 5.1.1 RESOLVER.ADR.RecipNotFound; not found ##
Original message headers:
Received: from SBS2011.censura.local ([fe80::8931:9f0c:27c2:4e29]) by
 SBS2011.censura.local ([fe80::8931:9f0c:27c2:4e29%10]) with mapi id
 14.01.0438.000; Tue, 7 Apr 2015 14:04:36 +0100
Content-Type: application/ms-tnef; name="winmail.dat"
Content-Transfer-Encoding: binary
From: Paul Marsh <>
To: "" <>
Subject: test3
Thread-Topic: test3
Thread-Index: AdBxM2WiF04aM3dxTiO1PHtoYUmKlg==
Return-Receipt-To: <>
Date: Tue, 7 Apr 2015 14:04:35 +0100
Message-ID: <1D5CF8B61968BB44A68F4402627CC277BF88458C@SBS2011.censura.local>
Accept-Language: en-GB, en-US
Content-Language: en-GB
X-MS-TNEF-Correlator: <1D5CF8B61968BB44A68F4402627CC277BF88458C@SBS2011.censura.local>
MIME-Version: 1.0
X-Originating-IP: []
Jian An LimSolutions ArchitectCommented:
can you run
and see whether exchange found it?

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censuraAuthor Commented:
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