Receiving IMCEAEX NDR for internal users on Office 365 RRS feed

  • Question

  • Hello,

    We have migrated from an on-site Exchange 2003 server to Office 365.  Whenever a user replies to an previously existing email from before the migration from an internal user, they receive an NDR (see below).  I have tried deleting the Auto-Complete cache in Outlook, with no luck.  I have also added an X500 proxy address, with no luck.  Please see the following http://support.microsoft.com/kb/2807779  as to what I did exactly.

    Can anyone provide some further assistance?


    NDR Error Message for your reference


    Diagnostic information for administrators:

    Generating server: CO1PR02MB047.namprd02.prod.outlook.com

    Remote Server returned '550 5.1.1 RESOLVER.ADR.ExRecipNotFound; not found'

    Original message headers:

    Received: from CO1PR02MB048.namprd02.prod.outlook.com ( by

     CO1PR02MB047.namprd02.prod.outlook.com ( with Microsoft SMTP

     Server (TLS) id 15.0.731.16; Mon, 5 Aug 2013 18:28:45 +0000

    Received: from CO1PR02MB048.namprd02.prod.outlook.com ([]) by

     CO1PR02MB048.namprd02.prod.outlook.com ([]) with mapi id

     15.00.0731.000; Mon, 5 Aug 2013 18:28:45 +0000

    Content-Type: application/ms-tnef; name="winmail.dat"

    Content-Transfer-Encoding: binary

    From: Sean Bowen <bowens@trinityklein.org>

    To: "Knox, Jeff"



    Thread-Topic: TESTING ALL CAPS

    Thread-Index: AQHOkgmdlj9NJD4qlU+szOs/HgUA1Q==

    Date: Mon, 5 Aug 2013 18:28:44 +0000

    Message-ID: <8D8A8B55-009C-4897-8990-B0A4D5C5A975@trinityklein.org>

    References: <DBC1625CA6097B47A893AA2FECC3519601756306@TK-EX01.Trinity1.TrinityKlein.local>

    In-Reply-To: <DBC1625CA6097B47A893AA2FECC3519601756306@TK-EX01.Trinity1.TrinityKlein.local>

    Accept-Language: en-US

    Content-Language: en-US


    X-MS-TNEF-Correlator: <8D8A8B55-009C-4897-8990-B0A4D5C5A975@trinityklein.org>

    MIME-Version: 1.0

    X-Originating-IP: []

    Return-Path: bowens@trinityklein.org

    Reporting-MTA: dns;CO1PR02MB047.namprd02.prod.outlook.com

    Received-From-MTA: dns;CO1PR02MB048.namprd02.prod.outlook.com

    Arrival-Date: Mon, 5 Aug 2013 18:28:45 +0000

    Final-Recipient: rfc822;IMCEAEX-_O=TRINITY+20MAIL_OUFIRST+20ADMINISTRATIVE+20GROUP_CN=RECIPIENTS_CN=KnoxJ@namprd02.prod.outlook.com

    Action: failed

    Status: 5.1.1

    Diagnostic-Code: smtp;550 5.1.1 RESOLVER.ADR.ExRecipNotFound; not found

    X-Display-Name: Knox, Jeff

    Monday, August 5, 2013 7:00 PM

All replies

  • Hi, have you checked if the recipient has the same display name inside Exchange Online?


    Alberto Pascual MVP-MCSA-MCITP-MCTS-MCP-O365MS-MCC http://blogs.itpro.es/guruxp

    Tuesday, August 6, 2013 6:31 AM
  • Alberto, I just tried your suggestion with no luck.

    Just to clarify, our migration went as follows:

    1. Created Office 365 users by importing a CSV file.
    2. Performed ExMerge of all users mailboxes on old Exchange 2003 server.
    3. Deleted user's old Exchange account from Outlook and added user's Office 365 account in Outlook, then imported pst file from ExMerge.

    Any other thoughts?

    Tuesday, August 6, 2013 1:22 PM
  • i would update the OAB (not just the changes, but the full details option)...

    Alberto Pascual MVP-MCSA-MCITP-MCTS-MCP-O365MS-MCC http://blogs.itpro.es/guruxp

    Wednesday, August 7, 2013 7:42 AM
  • Alberto,  how do I go about doing that?  I have a mix of users with Outlook 2007 on Windows, Apple Mail on Mac 10.8, and some using the Office 365 web portal.
    Wednesday, August 7, 2013 1:08 PM
  • Hi Sean, here are some links:

    For Outlook 2007 under Windows:


    For Outlook 2011 under Mac:


    For Apple mail i´m not sure how to achieve this and for Office365 under web portal users you don´t need to do anything as it does it automatically.


    Alberto Pascual MVP-MCSA-MCITP-MCTS-MCP-O365MS-MCC http://blogs.itpro.es/guruxp

    Thursday, August 8, 2013 12:10 PM
  • When you logon to owa, type in the name of a recipient for which you have the error. Do you have an error like "duplicate exists" or something?

    Also, try to open the recipient for which you receive the errors, make a modification (for example, add fake email address) > save > open again > remove address > save

    Friday, August 9, 2013 9:34 AM