I use BTinternet which is tied to Yahoo, in that system
beside the "Move", "Delete", buttons there is ... three
little dots, I click there and there is a drop down menu,
I can't remember all the options, but I click "BLOCK",
another small window opens and asks if I want to block
the senders and delete all previous from them, I click "Yes"
and it is all done.
I did this with every spam Email I received last year or in
2017 for about two weeks, after that time I have very rarely
received any spam, mainly ones that were not spam, but a
few ones that were, I also did the same with spurious ones
in my "In Box".
Now I only get mail from people who are OK.
Mike.