Spammers having to maintain that live server code/state, for regenerating the targeted email from the recipient-request, would've still been better than everyon

Spammers having to maintain that live server code/state, for regenerating the targeted email from the recipient-request, would've still been better than everyone else receiving & storing their junk! In the early days of email, fire-and-forget mailing, from fly-by-night servers, imposing costs on all recipients, was an actual problem.