#550 5.1.1 Outlook Meeting NDR

Posted on 2014-08-18
Last Modified: 2014-08-19

The following error occurs when one of my users tries to schedule a meeting in Outlook (Exchange 2007) with another user.

The interesting thing is that the user the NDR returned is against a user that has been deleted from the system for over 2 years and was not on the original invite.

I have tried non-cached mode for the OST. Renamed the NK2 file. Run the MS Fixit tool and tried using OWA. Non of these have worked.

The interesting thing is that sending a normal email works. It only fails when sending a meeting invite!

Any assistance would be most welcome - Thank you.


Delivery has failed to these recipients or distribution lists:
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: servername.domain.local
#550 5.1.1 RESOLVER.ADR.ExRecipNotFound; not found ##
Original message headers:
Received: from servername.domain.local ([fe80::12d:3f3a:5d38:5fbf]) by
 servername.domain.local ([fe80::12d:3f3a:5d38:5fbf%14]) with mapi; Mon, 18 Aug
 2014 13:37:21 +0100
Content-Type: application/ms-tnef; name="winmail.dat"
Content-Transfer-Encoding: binary
From: User Name <>
To: ExStaffUserName
Date: Mon, 18 Aug 2014 13:37:20 +0100
Subject: Test Appointment
Thread-Topic: Test Appointment
Thread-Index: Ac+64RB9CZI6/TNhT9Of745vI4rb4AAABZtg
Message-ID: <921A17FA27EEB6438BDF565180C2F7881C2D280639@servername.domain.local>
Accept-Language: en-US, en-GB
Content-Language: en-US
X-MS-TNEF-Correlator: <921A17FA27EEB6438BDF565180C2F7881C2D280639@servername.domain.local>
acceptlanguage: en-US, en-GB
MIME-Version: 1.0
Question by:tedporter
    LVL 6

    Accepted Solution


    Author Comment

    Hi Chad,

    Thanks for the quick response. I will need to check the users calendar settings.

    I will come back to you when I have checked. Likely tomorrow now.


    LVL 3

    Expert Comment


    Author Comment

    HI Paul,

    Thank you for your suggestion. I will also check this out along with Chads suggestion. I am going to the clients today.



    Author Comment


    The problem is now resolved and it was to do with the deleted user having rights to manage another users calendar.

    I have attached a couple of screen shots to show where the problem was.

    Calendar Properties
    Delegate Properties
    Thanks for you help.



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