According to the article, the USPS is promoting a feature where it will deliver junk mail to everyone in a specific geographic area without the need for the sender to have individual addresses on each piece. In other words, it will become impossible to opt out from a company’s junk mail.
The only way to stop the post office from sending junk mail is to make it unprofitable. One way to do that is to mark each one “return to sender” and throw it into the blue collection mailbox. If everyone did this, it will clog up the system and eventually stop this madness.
They won’t return junk mail; only first class. The junk mail you refuse goes into their trash. I know because I’ve asked.