Click the links below for Office 365 Delivery Restrictions tab information, additional information and technical support:

Office 365 Delivery Restrictions Tab

The O365 Delivery Restrictions tab allows you to control the users or groups from which the mailbox can accept messages. The tab has two sections:

  • Accept Messages From: where you can decide which users/groups (internal and external) are authorized to send messages to the mailbox.
  • Reject Messages From: where you can decide which users/groups are not authorized to send messages to the mailbox.

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How to Apply Message Delivery Restrictions

To restrict mailbox message delivery to select users:

In the Accept Messages From section, click the radio button next to Only senders in the following list: and click Add to add the users who are allowed to send messages to the mailbox (Fig.1). The mailbox will now be able to receive messages ONLY from those users listed in the Only senders in the following list: window.

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To reject mailbox message delivery from external users:

If you want the mailbox to reject messages from people outside the organization, click the check box next to Require that all senders are authenticated (Fig.1).

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To accept mailbox message delivery from all senders:

If you want the mailbox to accept delivery from all senders, click the radio button next to All senders (Fig.1).


Fig. 1 (Click image for magnified view)

Alternatively, you can also click the radio button next to No senders (Fig.2).


Fig. 2 (Click image for magnified view)

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To reject message delivery from select users:

In the Reject Messages From section, click the radio button next to Senders in the following list: and click Add (Fig.2) to add users whose messages you want the mailbox to reject. The mailbox will now reject messages ONLY from those users listed in the Senders in the following list: window.

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Additional Information

Click here to access links to other 365 Command AD Extensions related topics like System Requirements, Installation, Initial Configuration, Custom Tabs Functionality and Common Usage Examples.

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Technical Support

If you encounter any issues or have questions regarding 365 Command AD Extensions, please contact Technical Support.

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