Microsoft Exchange Server 2013: Configuring mailbox delivery restrictions, permissions, and storage limits (part 2) - Setting message send and receive restrictions on individual mailboxes

Open the Properties dialog box for the mailbox-enabled user account by double-tapping or double-clicking the user name in Exchange Admin Center.

On the Mailbox Features page, scroll down and then tap or click View Details under Message Delivery Restrictions. As shown in Figure 2, you can set message acceptance restrictions.

Figure 2. You can apply send and receive restrictions on messages on a per-user basis.

If you want to ensure that messages are accepted only from authenticated users, select the Require That All Senders Are Authenticated check box.

To accept messages from all email addresses except those on the reject list, under Accept Messages From, select All Senders.

To specify that only messages from the listed users, contacts, or groups be accepted, select the Only Senders In The Following List option and then add acceptable recipients by following these steps:

To specify that no recipients should be rejected, under Reject Messages From, select No Senders.

To reject messages from specific recipients, under Reject Messages From, select Senders In The Following List and then add unacceptable recipients by following these steps:

Tap or click OK.