Yes, all those adaptations could be expected... but they also all add extra costs to mass-mailing, perhaps enough to make it non-viable. (And if not: the requir

Yes, all those adaptations could be expected... but they also all add extra costs to mass-mailing, perhaps enough to make it non-viable. (And if not: the required token difficulty can be raised until unsolicited mass-mailing costs more than it earns.)