I do not believe any of this will work, unless there is a system set up that makes Email senders responsible for their messages - something like the way a "cookie" works, in reverse. It shoud be set up so that, if the person (or spammer) will not accept am Email acknowledgement back, (before the Email is accepted by my conputer), then the Email would be rejected. This way, if a spammer sends out a million Emails, they would get a million messages back. Yes, the would plug up anyone who's PC is an unknowing "slave," but that is another form of responsiblity the needs adressing. If I were to "look away" when someone borrows my car, and the person uses my car, in a non-responsible way - am I not also at fault?
I would enjoy sein these spammers get a million or more like their own back at them, and the only way this will happen, is if they are responsible for what they send out.
...Steve