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You can.... Same list as the opt out of phone calls. However, this one I've actually had luck with it working.

https://www.consumer.ftc.gov/articles/0262-stopping-unsolici...

In France you just put a sticker on your letter box with something like "no ads, thank you".

Since I did it my letter box is desperately empty except the occasional paper bill.

Won't work with junk mail that is directly addressed to you of course, but in my case it's not frequent, I'm probably not in many databases.

I'm in Paris, I did it and it had absolutely no effect. I guess the spammers don't care about these stickers or not bothering you. They just want to finish their spam job as soon as possible.

Royal Mail in the UK call them 'door-to-doors' and allow you to opt out here: https://personal.help.royalmail.com/app/answers/detail/a_id/...

It's a bit more than $5, but you can try a service like PostScanMail.com that will scan your mail for you and let you manage it virtually. You can choose to have certain items forwarded or opened and contents scanned.