e-postage, knows-SMTP-4, knows-SMTP-5 ->
https://www.rhyolite.com/anti-spam/you-might-be.htmlWe have cryptographic identity in SMTP already. In fact, almost all our protocols and formats for signing and identity were first adapted from email standards. This has already failed.
"You might be an anti-spam kook" does need to be updated to also include cryptocurrency solutions. You're neglecting the transaction costs associated with cryptocurrency, which might be punitive both for senders and for those attempting to collect the spam bounty. Of course the big email providers could aggregate settlements... but now we're back to having big email providers.
