Create the ability to block a spam email sender, based on username only (independent of domain) to clean up SPAM folder.
I get a ton of emails from specific usernames, who use a random domain name. These correctly get routed to SPAM by Yahoo, but it fills up the SPAM folder--making it harder to peruse that folder for valid emails which incorrectly get routed there. Blocking by specific username@domain name and by the domain name only doesn't work, since domain changes every time these SPAM emails are generated. Setting up a filter on username only (without domain) to route to trash doesn't work either because filters don't work on emails that Yahoo thinks are SPAM and routes to that folder.
Enhancing Yahoo Mail + to add SPAM filters with the ability to block username@any domain name (where they don't even show up in the SPAM folder) would be helpful to keep the SPAM folder more reasonable in size.