Receive restrictions for Exchange Online mail-enabled distribution groups
NOTE: The Assign mail acceptance and Assign mail rejection assignments are mutually exclusive. You can specify whether to accept or deny the recipient's message.
 
To modify mail acceptance for mail-enabled distribution groups
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In the Manager, select the Azure Active Directory > 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 mail acceptance task to specify recipients whose messages are accepted. - OR - Select the Assign mail rejection task to specify recipients whose messages are rejected. 
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Select the table containing the recipient from the menu at the top of the form. You have the following option: 
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In the Add assignments pane, assign recipients. 
TIP: In the Remove assignments pane, you can remove assigned recipients. To remove an assignment 
 
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Save the changes. 
 
    Customizing send permissions for Exchange Online mail-enabled distribution groups
Use the Send on behalf of send permission to specify which users can send messages on behalf of the distribution group.
To customize send permissions for mail-enabled distribution groups
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In the Manager, select the Azure Active Directory > 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 send authorizations 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 option: 
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In the Add assignments pane, assign users. 
TIP: In the Remove assignments pane, you can remove assigned users. To remove an assignment 
 
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Save the changes. 
 
    Specifying moderators for Exchange Online mail-enabled distribution groups
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 Azure Active Directory > 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 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 
 
- Save the changes. 
 
    Specifying Exchange Online mail-enabled distribution groups
Membership in mail-enabled distribution groups can be applied for and approved. Specify which users manage the mail-enabled distribution group and therefore can grant approval for membership in the group.
To specify a mail-enabled distribution group
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In the Manager, select the Azure Active Directory > 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 administrators task. 
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Select the table which contains the administrators from the menu at the top of the form. You have the following options: 
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In the Add assignments pane, assign the administrators. 
TIP: In the Remove assignments pane, you can remove assigned administrators. To remove an assignment 
 
- Save the changes. 
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