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Messages are not received when you send messages to a Distribution Group in Office 365 Dedicated/ITAR

When you send a message to a Dynamics Distribution Group (DDG) in Microsoft Office 365 Dedicated, the message is not received by any recipients. Additionally, you do not receive a non-delivery report (NDR). 
This problem occurs because the recipeintcontainer attribute of the DDG is set to an organizational unit (OU) that does not contain user objects when the DDG filter is configured to retrieve user objects.

In Office 365 Dedicated, there are separate OUs for Users, Groups, and Contacts.

When you create a DDG, you should specify the recipientcontainer attribute to use the User's OU.  If you create the DDG without specifying the recipientcontainer attribute, the recipientcontainer attribute will be set to the OU where the DDG is created. Generally, the OU is the Group's OU.
To resolve this problem, set the recipientcontainer attribute of the existing DDGs to the User's OU. To do this, run the following cmdlet: 
Set-DynamicDistributionGroup -recipientcontainer ""
For new DDGs that you create, specify the recipientcontainer attribute to the User's OU. To do this, include the following command in the New-DynamicDistributionGroup cmdlet: 
-recipientcontainer ""

To get the number of users in a DDG, run the following cmdlets:
$DDG = Get-DynamicDistributionGroup "<identity>"
$DDG2 = Get-Recipient -RecipientPreviewFilter $DDG.RecipientFilter

Note This will give an impact of the number of the affected users.

Article ID: 2623206 - Last Review: 03/17/2016 07:22:00 - Revision: 5.0

Microsoft Business Productivity Online Dedicated, Microsoft Business Productivity Online Suite Federal, Microsoft Exchange Server 2010 Enterprise, Microsoft Exchange Server 2007 Enterprise Edition, Microsoft Exchange Online

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