Yes, the default spam filter works great at Yahoo. One click and all in the spam folder is zapped.

I have had this yahoo account since 1998, 25 years, and have used it for all kinds of dicey reasons, like requesting samples. So all the spam has never been a surprise. I just wish yahoo auto-flushed the spam folder in three days instead of 30. My only concern is if my device is inaccessible (hospitalized or whatever) and I can't clean out the spam daily then the build-up may clog things so cannot deal with important emails.