I will pay $5/Month to make sure that I don't get any junk physical mail in my mailbox (US). I hate sorting through mails and I almost always know that 95% are junk.
Wow, I live in Queensland, Australia, and here if you put up a sign on your letterbox that says "Australia Post Only" or "No Junk Mail" or similar, your junk mail intake drops to basically zero immediately -- it's really effective. So effective actually that I've never had to lookup what actions to take if I still receive junk mail, because it just never happens. I looked it up just now and found this: https://www.ehp.qld.gov.au/waste/advertising-material.html
I am in Norway and all I have to do is put a sticker on my mail box, which basically says "No unsolicited mail" which stops the postman from filling my mailbox with junk mail. I usually take off the sticker during Christmas or near black Friday, so I can see if I am missing out on any good deals.
I wonder, if it would make sense, to have a service, which would receive all your mail, sorts it for you, throws out the junk, scans the rest and email that to you. In Norway, I rarely receive any important physical mail, especially since the government has started a secure email service[0], where you can receive your payslip and other important documents from government departments. The senders are pre authorized and pay a small fee to send an email to the user but the service is free for the user of the service.
I am in Canada so I don't know how things work south the border. But I heard from a neighbour, and a postman confirmed, that if you stick a piece of paper in your mailbox saying "please don't put ads", they won't do it.