Stop the postal junk mail looking to stop the junk mail that the post office place in our mail box from the post office

I get these coupon books placed in my mail box every week there should be a way to at least opt out or opt in first thing i do is throw away these papers but the post office say they have to deliver them i am sure that millions of people do the same these papers is a waist of time and trees please stop forcing this on people who don't want them