Wait, the US doesn't have a free service to (a) remove you from postal spam lists and (b) stop spam being delivered?
In the UK, I registered my address on a few of the things listed here ( https://www.citizensadvice.org.uk/consumer/post-and-parcels/stop-getting-junk-mail/ ). And the only junk mail I now receive are political flyers & takeout menus delivered outside of the postal service (ie by people, not posties).
Do Americans really have to put up with receiving random bullshit with no easy way of stopping it?!