John Levine writes:
Testing spam filters is a really, really hard problem, for all the
reasons that people have mentioned, basically that you can't test
without perturbing the system you're testing, and you can't capture
enough state to rerun the same test more than once. So you have to
estimate based on complaint rates from bounces and the like.
The Spam Heisenberg Uncertainty Principle. ;)
by the way this is one reason why I, personally, prefer to accept spam in
full, instead of rejecting during the SMTP transaction, greylisting, or
tarpitting. It's more practical to test and instrument that way, and
thereby get a solid idea of FP rates, instead of guesstimation.
--j.
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