Yakov Shafranovich writes:
We do not need to make standards for blocklists, however a small BCP might
be useful with things like a need to state clearly what your
listing/delisting policy is, etc. Most of the BCPs for DNSRBLs would center
around the need to state what is actually going on in inside one, not
actually trying to enforce specific policies. Additionally, support for
consent systems and associated protocols might be useful as well.
BTW is there a BCP for measuring spam filter effectiveness -- e.g. stating
that effectiveness should be measured in terms of portable numbers like
FP% = (false positives as a percentage of nonspam mail)
FN% = (false negatives as a percentage of spam mail)
? This would be valuable.
I've found that often, DNSBL effectiveness is stated as "it blocked this
much spam" with no discussion of false positive or negative rates. Once
the FP% and FN% are measured, the picture becomes a lot clearer ;)
--j.
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