Based on your advice from a previous thread, I played around with Yahoo Mail's filters. Basically, it looks like you can filter the body, title, sender, and CC.
For example, I'm getting spam for some magic space heater with Elon Musk's name in the title. I put delete to trash the word elon, not case sensitive, in all 4 categories. Did the same for Fidelity, and ADT
As you can see from this screen shot, it ain't working. Am I using these filter correctly? The parameter I used for the action was ALL, meaning all of the body, all of the title, etc... Trying to combat this is a bastard's game.