My review of messages from Constant Contact and other major E.S.P.s is that they do obtain and use a DKIM selector when the domain has dmarc enforcement.
Earlier in this discussion I was assured that conditionally applying the right signature was not a significant burden for them. Scaling does not seem to be a problem yet. On Tue, Dec 29, 2020, 3:11 PM John Levine <[email protected]> wrote: > In article <[email protected]> you write: > > > >On 12/29/20 10:59 AM, John Levine wrote: > >> > >> Don't forget > >> > >> o Normal forwarding of SPF validated mail > >> o Authorized third party senders with no access to DKIM keys > >> > >If by "authorized" you mean authorized by the originating domain, I don' > >t have a lot of sympathy since they can delegate them a selector and > >update their DNS. Not doing so is just lazy. > > A lot of tiny non-profits like Girl Scout troops use email addresses > at webmail providers and send their announcements through ESPs like > Constant Contact and Mailchimp. This is yet another situation where > DMARC can't describe an entirely normal mail setup. > > Constant Contact apparently got Yahoo to give them a signing key, > at least temporarily, but that doesn't scale. > > R's, > John > > _______________________________________________ > dmarc mailing list > [email protected] > https://www.ietf.org/mailman/listinfo/dmarc >
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