The following article contains instruction on how to block an unsafe message sender and remove an address from the block sender list.

How to Block A Sender:

1. Open the message of the sender you wish to block.
2. Within the ribbon, select the drop down arrow on the Junk button.

3. Select the option, Block Sender.

Note: An alternate way is to simply right click the message, Select Junk Mail and then Block the Sender.

How to remove an address that has been blocked:

1. Open your Outlook 2011 Client.
2. Along the navigation pane, select tools, then Junk E-mail Protection.

3. Click the Block Senders tab. 

4. Locate the address you wish to unblock and remove the address.
5. Select OK when finished.