I acually *want* some people to send me email, including but not limited to the debian security advisories mailing list. If I did not use SMTP this would not be possible and that is worth more to me than avoiding spam.
So far the best solutionm I have found is a combination of spamassassin and reporting spammers to their ISPs---the latter at has limited my spam to a few per day from what is apparently many faces of a worldwide stock spamming network.
A proposal which prevented spammers from emailing me but not other people would have a lot of traction. It is moderately hard to imagine now such a proposal would work in these days of unreachable hosts behind NAT gateways.
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