Not sure about the legality and such, but rate limiting by economics does work for my physical mailbox. I get spam, but it isn't 1000+ letters a day like my email inbox. If I was allowed to increase the cost of delivery to my house, I think I could eliminate most physical spam mail in my physical mailbox as well or happily find a price where I'd quit my dayjob and just read whatever physical spam is sent at an hourly rate I'd like.
Not sure about the legality and such, but rate limiting by economics does work for my physical mailbox. I get spam, but it isn't 1000+ letters a day like my email inbox. If I was allowed to increase the cost of delivery to my house, I think I could eliminate most physical spam mail in my physical mailbox as well or happily find a price where I'd quit my dayjob and just read whatever physical spam is sent at an hourly rate I'd like.