If you bothered to read the linked USPS page, you’d know that “refusing” mail does not prevent you from receiving it. It just means you can give it back to your mailman. Lower on the page it discusses what I mentioned, that there’s voluntary opt-outs that some companies will abide by.

There is no way to tell USPS to not deliver junk mail to you.

That’s for porn. Nothing else. Again with the not reading huh?

As determined and assessed by the recipient.

https://news.ycombinator.com/item?id=32038862