Block or Unblock Sender (MacBook)

 Block a sender

1. In the message list, select a message from the sender that you want to block.

2. In the Outlook menu, select Message > Junk Mail > Block Sender.

3. Outlook adds the sender's email address to the blocked senders list.

   Note: You can restore any of the mail that is in the Junk email folder. Select the message that you want to move to the Inbox folder, and then on the Home tab, from the ribbon select Junk, and then Not Junk.

    

Unblock a sender on non-Exchange based accounts

1. In the Outlook menu, select Tools >Spam Email Preferences.

   Note: If Junk Email Preferences is grayed out your account may be hosted by Exchange. See Unblock a sender on Exchange based accounts below.

2. On the Blocked Senders tab, select the email address or domain you want to unblock, and choose the Remove the selected sender button .

Unblock a sender on Exchange based accounts  

Exchange accounts, like Outlook.com or your work email account hosted by Exchange, do not have access to the Junk Mail Preferences.
For those accounts junk mail filtering is handled on the Exchange server and is not a client option.  
To remove a blocked sender, see Block or allow (junk email settings).