How do I block email that isn't from my contacts?

I keep trying to block email that isn't from my contacts but, I don't know how to. It is so annoying that I keep getting all this email from people from my yahoo 360. How do I block them and how do I only get email from ONLY my contacts?

How do I block email that isn't from my contacts?
Go to (my place) then go there click it.


I hope I'm answer it right because I have not been in 360 for while.


I'm not sure if this going to work or not.