I was reading this expecting it to lead to a solution for e-mail spam.

I suspect it didn't because there's no solution to e-mail spam, at least not with the SMTP protocol as it exists today.

I recently started using Tutanota. Their spam filter is worthless, and doesn't learn jack shit. Notifications messages from a monitoring service that I do want to see get placed in the Spam folder, and at the same time my Inbox is filled with super obvious spam that keeps arriving, even after I've marked as Spam numerous nearly identical prior ones. But I refuse to go back to Google or any of the other 4 services that Lopp is referring to.

e-mail is still broken, 50+ years since the first spam / abuse occurred.

I'm hoping that if I just ignore all e-mails, e-mail as a communication medium will go away.