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:
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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
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Select the moderator and double-click
.
 
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 - Save the changes.