Exactly. Let's make the mailbox actually useful again by removing the monopoly on it. Then banning the USPS from delivering spam would be a good next step.
Why do you keep pointing out the “monopoly” on mailboxes? Yes, only the USPS can legally put your mail in it, but you’re missing the point: a private corporation should not run something as important as mail. Yes, private couriers are a thing, but the USPS is essential.
Even today, not everyone has an email address. And those that do, they’re at the whims of the corporation. In my original comment, I mentioned google banning people’s entire accounts because they did what the streamer wanted. Would you like your email account to be inaccessible when you decide to protest that corporation?