Filtering email happens before it gets to your device.
You need to log into each acct online and see what is available there.
Yahoo for example allows you to enable or disable their spam filter.
Also, download the Yahoo mail for android app, this has the ability to mark emails as spam. Once you mark enough of a certain type it will learn future emails of the same type are spam.
At least thats whats working for me on my yahoo acct.
Hey Gekko, why bother posting that, i dont see how its very helpfull to him. Either give him help or dont bother. But telling him to suck it up is just lame. I expect more form someone who is labeled as an "Android Specialist"