> 
> 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.  

> 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.

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