Moderated distribution groups let a moderator approve or deny messages sent to a mail-enabled distribution group. Only after a message has been approved by a moderator can it be forwarded to members of the mail-enabled distribution group.
To specify moderators for a mail-enabled distribution group
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In the Manager, select the Microsoft Entra ID > Mail-enabled distribution groups category. 
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Select the mail-enabled distribution group in the result list. 
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Select the Assign moderators task. 
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Select the table which contains the user from the drop-down at the top of the form. You have the following options: - 
Mailboxes 
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Mail contacts 
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Mail users 
 
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In the Add assignments pane, add the moderators. TIP: In the Remove assignments pane, you can remove assigned moderators. To remove an assignment - 
Select the moderator and double-click . 
 
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- Save the changes.
