Based on my frustration with observed product offerings, it feels like no one has articulated a reference model of how spam filters should operate -- either that, or the vendors are just ignoring such work. The SPF / DKIM / DMARC standards define what senders should do, but I don't think it says much anything about what the receiving system should do to resolve ambiguity when these features are not fully implemented by the sender. Does this group know of prior work to define such a reference model? Doug Foster
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