[Mailman-Users] Gmail and DMARC
jimpop at gmail.com
Sat Apr 26 08:39:17 CEST 2014
On Sat, Apr 26, 2014 at 2:24 AM, Stephen J. Turnbull <stephen at xemacs.org> wrote:
> Jim Popovitch writes:
> > TBH, I'm not sure what else there is to look for. :-) GMail, every so
> > often, is telling my Mailman that it needs to Auth in order to reflect
> > From:gmail to other gmail customers. It's like DMARC without
> > following the DMARC standard (GMail has a p=none policy).
> Is it possible that those users are using their GMail address from a
> non-Google host? That would explain the intermittent nature of the
> challenge -- it doesn't have the GMail DKIM signature that identifies
> GMail-from-GMail messages. And it would also explain why it "looks
> like" DMARC, since DKIM is one of the underlying protocols used to
> implement DMARC.
I strip any existing inbound sigs. The GMail senders were using GMail
This looks more and more like a lazy DNS issue, as the MX for GMail
has flip-flopped over the past ~24 hours. I honestly think that GMail
rotated in a wrong server...the only other possibility is that
powerdns cached a record beyond it's TTL.
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