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Forwarding meeting requests from 2007 to 2003 - Bounces

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  • Forwarding meeting requests from 2007 to 2003 - Bounces

    Consider the following scenario:

    Company A with domain abc.com is on Exchange 2007
    Company B with domain xyz.com is on Exchange 2003
    sites are connected with an encrypted IPSec tunnel and the send/receive connectors are using authentication.

    User1 at Company B creates a meeting and invites User2 from Company A. User2 receives and accepts the invite fine. However, User2 wants to forward the invite to another person (User3) at Company B.

    As soon as User2 fowards the invite to User3, User2 gets a bounce back message:

    Delivery has failed to these recipients or distribution lists:
    User3
    Your message wasn't delivered because of security policies. Microsoft Exchange will not try to redeliver this message for you. Please provide the following diagnostic text to your system administrator.


    Diagnostic information for administrators:
    Generating server: ex2003.xyz.com
    User3
    #< #5.7.1> #SMTP#
    Original message headers:
    Received: from ex2007.abc.com ([1.1.1.1]) by ex2003.xyz.com with
    Microsoft SMTPSVC(6.0.3790.3959); Wed, 10 Feb 2010 08:43:15 -0500
    Received: from ex2007.abc.com ([1.1.1.1]) by ex2007.abc.com
    ([1.1.1.1]) with mapi; Wed, 10 Feb 2010 07:43:14 -0600
    From: User1
    To: User3
    Sender: User2
    Date: Wed, 10 Feb 2010 07:43:11 -0600
    Subject: Test
    Thread-Topic: Test
    Thread-Index: AcqqVJblJUL2iZgQSIGDhrRbc7tYqAAAAADQAACUFRA=
    Message-ID: <
    [email protected] abc.com>
    Accept-Language: en-US
    Content-Language: en-US
    X-MS-Has-Attach:
    X-MS-TNEF-Correlator:
    acceptlanguage: en-US
    Content-Type: multipart/alternative;
    boundary="_000_1CBA0608AA69D748B9E247AC376C4E24166 F43E0EEex2007abccom_"
    MIME-Version: 1.0
    Return-Path: User2
    X-OriginalArrivalTime: 10 Feb 2010 13:43:15.0472 (UTC) FILETIME=[FEF2E100:01CAAA56]



    Eventually, CompanyA's server will be decomm'd and mailboxes will be moved to CompanyB's server however I was hoping to find a workaround until this happens.

    Any thoughts?

  • #2
    Re: Forwarding meeting requests from 2007 to 2003 - Bounces

    The NDR message doesn't look like Exchange. Saying just SMTP isn't normal. Therefore I would be suspecting something between the two servers blocking the message type.

    Simon.
    --
    Simon Butler
    Exchange MVP

    Blog: http://blog.sembee.co.uk/
    More Exchange Content: http://exchange.sembee.info/
    Exchange Resources List: http://exbpa.com/
    In the UK? Hire me: http://www.sembee.co.uk/

    Sembee is a registered trademark, used here with permission.

    Comment


    • #3
      Re: Forwarding meeting requests from 2007 to 2003 - Bounces

      Originally posted by Sembee View Post
      The NDR message doesn't look like Exchange. Saying just SMTP isn't normal. Therefore I would be suspecting something between the two servers blocking the message type.

      Simon.
      Hi Simon,
      Interesting point. I'll check with the other company's admin and see if the messages are going through some sort of preliminary filtering server which may be rejecting it.

      I sent a test email to a known invalid address on CompanyB's server and the bounceback came back with:

      Generating server: ex2007.abc.com

      [email protected]
      ex2003.xyz.com #550 5.1.1 User unknown ##


      Original message headers:

      So CompanyA's server (my server) couldn't complete the message transfer since the user didn't exist on CompanyB's server and generated the bounceback.

      In my original post, the generating servername was ex2003.xyz.com (CompanyB) which would tell me that ex2007.abc.com successfully delivered the message to some intermediary server (successfully because I could verify by looking at the smtpsend protocol logs on Ex2007.abc.com and follow the entire message transfer commands up until message queued) and then that intermediary at CompanyB tried to send it to ex2003.xyz.com which bounced it back.

      Am I on a logical path here?

      Comment


      • #4
        Re: Forwarding meeting requests from 2007 to 2003 - Bounces

        The most efficient way of bouncing email is at the point of delivery. If the email was rejected at that point you wouldn't see any reference to the remote site in the NDR. The fact that you do would tend to indicate the problem is not at your end, but is later in the path.

        Simon.
        --
        Simon Butler
        Exchange MVP

        Blog: http://blog.sembee.co.uk/
        More Exchange Content: http://exchange.sembee.info/
        Exchange Resources List: http://exbpa.com/
        In the UK? Hire me: http://www.sembee.co.uk/

        Sembee is a registered trademark, used here with permission.

        Comment


        • #5
          Re: Forwarding meeting requests from 2007 to 2003 - Bounces

          As a follow up - we fixed this by disabling authentication on the connector on (our) CompanyA's server. When you forward an invite, it apparently forwards it on behalf of the original user and the authentication was causing the problem.

          Comment


          • #6
            Re: Forwarding meeting requests from 2007 to 2003 - Bounces

            Yeah you got it right

            From: User1
            To: User3
            Sender: User2

            Return-Path: User2

            The return path and from address are different.
            Thanks & Regards
            v-2nas

            MCTS 2008, MCTIP, MCSE 2003, MCSA+Messaging E2K3, MCP, E2K7
            Sr. Wintel Eng. (Investment Bank)
            Independent IT Consultant and Architect
            Blog: http://www.exchadtech.blogspot.com

            Show your appreciation for my help by giving reputation points

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