Well, Robert, you block the address(es) - in a special way.
Look for the 'Options' link at upper right corner of mail screen and click on it
Options /mail options
Click on 'spam' in the list on the left.
Then in 'Blocked Email Addresses,' enter the E-mail address you wish blocked, in the box after 'Add a blocked address' and click on the 'add' button -
block the entire domain, by putting in
for instance: *@seeyou.com
In your case, you want to type in *@hotmail.com, then click on 'save changes' at top left of screen.
You will never get mail from that domain again.
Hope this helps