Hi !!
>> because they have an incompetent mail administrator is *not* a false
>> positive. It may well be decided that such a test causes too many
>
> any case where your spam filter blocks a mail that a user
> wanted to receive is a false positive. If you ask your
> users, ``should I block email you want to receive because
> it came from a host which didn't have a reverse-DNS
> name?'', what would they say?
you can say that it will block legitimate mail but from the
point of view of the test a false positive/negative is a
message that is incorrectly classified. If you pretend to
detect spam based on rdns then it's a false positive but
if you just pretend to reject non rfc compliant hosts then
there are no false positives.
--
Best regards ...
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