FAQ: How to Block E-Mails/Senders

Solution:

How do I block unwanted messages in OWA?

You can use Outlook's Blocked Senders list to block unwanted messages
from people so their messages are automatically moved to the Junk E-Mail
folder.  Follow the below steps to do this:

Note:  Caution should be used when blocking senders as you may accidentally
          block someone you need to get e-mails from.  It is a good practice to
          periodically check your "Junk E-Mail" folder for such e-mails.  See
          "FAQ:  How to remove a user from blocked senders list"

1. Click "Actions" link
   
2. Highlight "Junk E-Mail"
3. Select/Click "Add Sender to Blocked Senders List"
   

Or

1. Right-click message you want to block
2. Click "Junk E-Mail"
3. Select/Click "Add Sender to Blocked Senders List"