DMARC rejects had great utility in my time working at an ESP. They would have little or no utility for forwarded messages. It would be interesting to see the spread of DMARC rejects for forwarded versus non forwarded messages. Although it wouldn't change the fact that the responses are indeed useful to many significant parties.
On Thu, Nov 21, 2019, 7:02 AM Steve Atkins via mailop <mailop@mailop.org> wrote: > > On 21/11/2019 13:10, Luke via mailop wrote: > > ???? > > One of the features of email is that it you can send responses back about > the status or handling of a message. Here's one such response from a gmail > server: > > *550 5.7.1 Unauthenticated email from domain.tld is not accepted due to > domain's DMARC policy. Please contact administrator of domain.tld domain if > this was a legitimate mail.* > > Matt is right. Bounces like this tend to get peoples' attention and it is > worth doing. Curious to learn more about what Rathbun said about not being > able to accomplish this at scale. The challenges involved in that are > beyond me but it does seem like Google is doing it. > > The most common case for DMARC declining to accept legitimate messages are > because they've been forwarded (e.g. the tampering with the From: header on > this mailing list is an attempt at mitigation of one situation where that > happens). > > Where do you think that 5xx message will be seen in the case of normal > email forwarding? Do you expect it to be converted by them to an > asynchronous bounce? Where do you expect that bounce to be delivered? Do > you expect it to be seen by humans? By automation? > > Cheers, > Steve > > > > Oh...And I'm certain Google also sent a DMARC report :P > > > On Thu, Nov 21, 2019 at 4:34 AM Andrew C Aitchison via mailop < > mailop@mailop.org> wrote: > >> On Wed, 20 Nov 2019, Matt Vernhout via mailop wrote: >> >> > If a sender asked you to reject that mail with their policy do them >> > a favour and send a bounce that says something like ‘your DMARC said >> > to bounce failed messages, if this is wrong fix your authentication >> > and try again’ >> >> ???? >> >> One of the features of DMARC is that it provides URLs for >> reporting failed messages. >> >> > Bounces like this tend to get people attention. >> >> -- >> Andrew C. Aitchison Kendal, UK >> and...@aitchison.me.uk >> _______________________________________________ >> mailop mailing list >> mailop@mailop.org >> https://chilli.nosignal.org/cgi-bin/mailman/listinfo/mailop >> > > _______________________________________________ > mailop mailing > listmailop@mailop.orghttps://chilli.nosignal.org/cgi-bin/mailman/listinfo/mailop > > _______________________________________________ > mailop mailing list > mailop@mailop.org > https://chilli.nosignal.org/cgi-bin/mailman/listinfo/mailop >
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