Vernon Schryver wrote:
People whose livelihoods depend on mail cannot, will not, and do not
accept false positive rates above 1%.
We have to remember, however, that the "true" false positive rate isn't
determined _solely_ by how much legitimate email your filters block, but
by the amount of legitimate email that doesn't get through.
They may seem to be the same, but it isn't.
A full bore TMDA (all first time email carries a "click this link to let
the email through") has a 100% false positive rate in the filters first
go-round. But if the senders follow the instructions, it's 100% delivery
in the end. [Presuming it works as it's supposed to, and you don't have
senders with broken mailers that can't see/display the returns.]
Discussions of false positives has to take into account what you do with
a reject, and the practises you follow to rectify problems.
Yes, my management would draw and quarter me if our false positive rate
got above even .01%. It is. False positive handling is part of the
insurance to make sure that we eventually do deliver all legitimate email.
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