If you are still getting spam email or you have an annoying friend who doesn't leave you alone, there is a solution solution.
Stop them from reaching your inbox and automatically delete their messages. You can do that by adding their email address to the blocked address list in your Yahoo Mail account settings. 1. Logon to your Yahoo Mail account and click on the Options --> Mail.
2. Select Block Addresses in the left panel.
3. Add the email to the Blocked Email Addresses list by typing in the field and clicking on Add.
You can always come back and remove any email address or domain from the list by highlighting an entry and clicking on Remove.