Heuristics for this are quite simple to generate. But it needs verification, confirmation, authorization before it can be automated. That is what makes it a heuristic and doesn't belong in the SMTP transport where this protocol can be implemented if only from a delayed learning concept, i.e. similar to a grey listing concept. In general, A typical reason to automate is to reduce the human involvement cost.
It was long known this would be a complex integrated solution. No matter what, the MLM receiver must also follow policy protocol, all receivers, there is not just one, but two at a minimum with this type of mail steam. Even if the simplistic DNS call solution is (erroneously) pushed aside, again, the MLM must still support the rejection at the submission point for those that do not wish to have a more complex, costlier, alternative delegation or any resigner involved. If not, it didn't solve the problem and it just made the DKIM integration design extremely more complex! -- Hector Santos http://www.santronics.com > On May 9, 2015, at 11:07 AM, Murray S. Kucherawy <[email protected]> wrote: > >> On Sat, May 9, 2015 at 2:00 AM, Stephen J. Turnbull <[email protected]> >> wrote: >> > Agreed again. And as Terry has said and I think we can infer about >> > other large operators, it's incorrect to assume (and plain wrong to >> > assert) that this is an easy problem for them to solve in a >> > reliable way. >> >> Please define "reliable." I gather you all think that missing some >> mailing lists is a bigger problem than missing all of them, but for >> the life of me, I cannot see why. > > I'm having trouble coming up with a heuristic that is even certain to grab > "most" of them. > > -MSK > _______________________________________________ > dmarc mailing list > [email protected] > https://www.ietf.org/mailman/listinfo/dmarc
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