OK modification of requirement 0:
0A) MUST actually reduce the amount of spam by a degree comensurate to the
cost.
0B) MUST NOT cause unaceptably high numbers of wanted messages to be lost.
These can be thought of as subcases of requirement #1 of course, however
they seemed to be sufficiently neglected in certain situations as to require
some restatement.
Phill
Perhaps we could get to some minimal requirements for any
proposed solution:
0A) MUST actually reduce the amount of spam.
0B) MUST NOT cause wanted messages to be lost.
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