Hi!

first of all you must sign-in to your account.
1. go to option menu
2. choose mail options
3. go to spam
4. then type the email address you want to block
5. then save changes

hope this things help you

try to read this: hubpages

Go to "Options" on the right side of your email page

"Block Address" - Enter the address you want blocked
"Add Block"
“Save”