After some chatter inside MAAWG and on the ietf-smtp mailing list, I've started
an outline for a BCP on the practice of greylisting. The main purpose is to
explain what it is, discuss the pros and cons of its variants, and give some
recommendations for implementation and configuration for a few example
installations and policies.
The draft (which is currently only an outline) is here:
https://datatracker.ietf.org/doc/draft-kucherawy-greylisting-bcp/
Comments welcome.
-MSK
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