On Tue, Sep 15, 2020 at 11:55 AM John Levine <[email protected]> wrote:
> In article <CAMSGcLDKRMbJ_30jZdKE_6hkKaktwBxU6_E=E= > [email protected]>, > Joseph Brennan <[email protected]> wrote: > >"Domain administrators must not apply dmarc authentication to domains > >from which end users send mail that may be re-sent via lists or > >automatic forwarding." -- done. Then dmarc will be simple and > >reliable, and bank statements and similar messages are protected as > >intended. Building in a standard workaround significantly weakens the > >whole concept, doesn't it? > > Unfortunately, we have ample evidence that domain operators will > ignore that advice. > > According to someone who was in the room when Yahoo flipped the > switch, the person in charge said words to the effect that I know this > will screw up everyone's mailing lists and I don't care. > > The irony is, the result being to diminish the effectiveness of dmarc for everybody. Joseph Brennan Lead, Email and Systems Applications Columbia University Information Technology
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