> > That's one way to do permission based e-mail. You can also do
> > cryptographically signed messages with a white list. It's simpler and will
> > in practice be about as effective and less of a pain to use. It's similar
> > to the way that private mailing lists stop spam except better because
> > addresses can't be spoofed as they can in normal e-mail.
> But that doesnt stop spam. You still have to check a possibly spammable
> keyspace.
A whitelist effectively stops spam. You have to check a possibly spammable
keyspace, spam can be removed from it mechanically. Think cash requires
this as well. It just uses a token instead of a signature as the
credential which it checks when removing spam.
> > 3) Human filtering of spam. Not relevant for e-mail, but relevant for
> > newsgroups and mailing lists. It works on normal moderated newsgroups
> > today.
> My discussion specifically involved ways to eliminate or vastly reduce
> spam.
Yes, human filtering eliminates spam for the users of a list/group.
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