Moderated mail users are implemented to accept or reject messages sent to a mail user by a moderator. The message is not sent on until it has been approved by the moderator.
To specify moderators for a mail user
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In the Manager, select the Azure Active Directory > Mail users category. 
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Select the mail user 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 menu 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.
