You can easily block specific senders within Outlook. The easiest method is to right click on the email from the sender you want to block and select Junk from the menu, then choose “Block Sender”. This will add that email address to your Blocked Senders list.
You can also add or manage your Blocked Senders list within Outlook by clicking on the Home tab along the top, then select Junk and finally select Junk Email Options. In the window that opens, you will see a tab named Blocked Senders. Clicking on this tab will allow you to add the specific email to be blocked. You can also edit or remove any addresses or domains that had previously been blocked. Please note that blocking entire domains is not supported at this time.
Note: Addresses that are added to Blocked Senders will result in emails from those addresses being delivered directly to the Junk Email folder in Outlook.