saw a similar one on facebook which turned out his blocked sender list was 90% full. Cant remember how many you can have.
thats why thats a complete waste of time. Whistling in the wind.
Blocking senders that dont actually exist (spoofed)
Block one (spoofed) sender , another 3 start sending spam .
Its been how long now, and some are still having spam issues. I dont think its going to be fixed for those with major spam issues .
If its such an issue move to gmail & forward xtra email there.
If just getting 3 or 4 a day. Live with it, get on with your life . A few a day is not too bad.