Humorous that the 3 options are all laughable:
Billing the sender for spam? wtf? How are they going to do that? You'll have to have a credit card to send email now? Fuck that!
You've gotta solve a puzzle every time you want to send email? Yeah, fuck that too.
A computational puzzle that will take a computer too long for a mass-mailer - exploit city right there. It will take all of a couple of months before some some 19 yearl old computer whizz cracks a way to generate seemingly authenticated emails that were never authenticated.
Bill, I'll give it to you, you've had some awesome ideas over the last 20 years, but shutting down spam is going to take more work than you think pal.
What about legitimate mass mailing i.e. to an affiliate or member group? Wouldn't these things make those prohibitively expensive too.
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