Actually, your last quoted paragraph is directly related to this thread and is well placed here, I think.
One, called DMARC, is a global registry that lets retailers and other companies register the servers they use to send the kind of mass mailers some people enjoy receiving. Messages purporting to be from those companies but coming from an unregistered address would get flagged. It's a compelling idea, but as with most proposed solutions, trying to get everyone on board has been costly and time-consuming.
That idea ought to be getting a huge boost from the spoofing problem we've been discussing.
