I have a new Windows 2008 AD (let's call it newdom.com) and a new Exhange 2007 server. I'm running Outlook 2007. Within Outlook, I created a contacts folder which contains the contacts for a customer I remotely support (let's call there domain synco.com). Occassionally, when I send an email to someone in the synco.com domain, I can see the name be resolved correctly to username.synco.com, but when I send the email I get the 5.1.1 RESOLVER.ADR ndr. To me, what's odd about it is that in the message headers, it appears that my Exchange server (?) is replacing their domain information with my domains context information. See below. Diagnostic information for administrators: Generating server: mail.mydom.com IMCEAEX-_O=Synco+20Company_ou=synco_cn=Recipients_cn=micfir@mydom.com#550 5.1.1 RESOLVER.ADR.ExRecipNotFound; not found ## Original message headers: Received: from mail.mydom.com ([::1]) by mail.mydom.com([::1]) with mapi; Mon, 7 Dec 2009 14:39:55 -0500Content-Type: application/ms-tnef; name="winmail.dat"Content-Transfer-Encoding: binaryFrom: Bob Word <Bob.Word@mydom.com>To: "First, Mick (Mick.First@synco.com)" <IMCEAEX-_O=Synco+20Company_ou=synco_cn=Recipients_cn=micfir@synco.com>Date: Mon, 7 Dec 2009 14:39:53 -0500Subject: test emailThread-Topic: test emailThread-Index: Acp3dQvemT80u8rdSlu9NpHhe+cpkQ==Message-ID: <E2BCD06AC1D21F4D8C2A2FF28CD023D412AF600E@mail.mydom.com>Accept-Language: en-USContent-Language: en-USX-MS-Has-Attach:X-MS-TNEF-Correlator: <E2BCD06AC1D21F4D8C2A2FF28CD023D412AF600E@mail.mydom.com>MIME-Version: 1.0Any ideas why this is happening?

Hi, Would you please let me know if you clear the NK2 cache for Outlook, delete a contact from Contact folder, then send email to the deleted contact by typing his email address manually, whether the issue can be reproduced? How to reset the nickname and the automatic completion caches in Outlook http://support.microsoft.com/kb/287623/en-us ~~~~~~~~~~~~~~~~ Mike Shen TechNet Subscriber Support in forum If you have any feedback on our support, pleasecontact tngfb@microsoft.com ~~~~~~~~~~~~~~~~

Yes, I did see articles related to the cache, and deleting entries manually, which I did, but the issue still occurs.

Hi, If you send message by using OWA, whether the issue still occurs? If you refer to my previous thread to delete the contact and type email address manually, whether the issue can be reproduced? ~~~~~~~~~~~~~~~~ Mike Shen TechNet Subscriber Support in forum If you have any feedback on our support, please contact tngfb@microsoft.com ~~~~~~~~~~~~~~~~