On Tue, Sep 15, 2020 at 12:02 PM Joseph Brennan <[email protected]> wrote:
> > > 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 > > > Can you support your assertion with data? There was zero change post-yahoo/AOL implementation vs pre-yahoo/AOL implementation for the organization I worked for at the time. Michael Hammer
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