If you could re-invent / re-imagine how email works (protocols): what would you change to make spam prevention easier / the default rather than reactive?
@quintessence A per-email calculation cost, like some prime factoring, maybe. Configurable at the server so that as computers advance, you can require a larger computation, or if the user has allowlisted the sender, skip it.
Yes, ham email becomes more expensive, but honestly, "free" email that's paid for with ads and data harvesting has been its own kind of problem anyway.
(Also, I suspect total electricity use for all email would go DOWN with sufficient spam reduction.)
@quintessence no concept of mail relay, with the assumption that every IP address can reach every other address.
If the sending IP doesn't resolve as a sender for the domain, the email gets rejected.
Mailing lists have to rewrite the from address to one of their own. No argument.
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