Recognizing mail from known correspondents is a very thoroughly solved
I agree, yet my system is designed to recognize mail from unknown sources.
I don't see you proposing anything that S/MIME doesn't do better. If
you S/MIME sign all your mail, each message has the key that
recipients need to recognize future mail from you, and existing MUA
address books already support it.
But the spam problem is not the same as the introduction problem. ...
Again, updates by a minuscule number of MUAs effectively eliminates the
introduction problem for this system. Discussion lists like this one would
never face the introduction problem if the administrator used one of the
Right, so if I am a spammer, I need only subscribe to high-traffic lists,
collect the subaddresses as they come by, and then blast away.
Tracking all of the sub-addresses does not strike me as a
strenuous task in an age where we have email systems that hash every email.
This might be a good time to review the difference between O(N) and O(N^2).
Incidentally, if you think this is such a good idea, why don't you
write a Thunderbird add-in to support it? It's all open source, you
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