On Tue, Mar 21, 2023 at 8:37 PM Scott Kitterman <ietf-d...@kitterman.com> wrote:
> > >> 1. Do receivers keep tabs on which users are using things like > >> mailing lists to differentiate users who expect to get indirect mail > vs > >> those who don't? > >> > >> The large mailbox operators might have hints about this, but I'm not > sure > >the answer would serve to further constrain the problem statement. > > I think it relates to the largest challenge to the problem statement: what > distinguishes these 'bad' messages from 'good' indirect mail flows such as > mailing lists. As far as I can tell, the answer is nothing, which leaves > it challenging to produce an effective protocol change which addresses > replay that doesn't also have substantial side effects on non-replay > traffic. > I agree, but: Do you believe knowing the answer to this question would allow us to amend the problem statement to something that might allow a protocol solution? My point is that I don't think it would. -MSK
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