That has been widely discussed many times, I'd suggest starting with the DMARC FAQ here: https://dmarc.org/wiki/FAQ
And yes, it has a negative impact on a number of practices, probably the worst impact to many technical folks is the effect on mailing lists. Brandon On Wed, Jun 15, 2016 at 7:12 AM, Geoff Mulligan <ge...@proto6.com> wrote: > I guess what I'm trying to understand is why anyone would base their > acceptance or rejection on the 822 From: header. It seems that this causes > mailing list managers to have to jump through hoops to rewrite the From: > header in strange ways. > > Geoff > > > > On 06/15/2016 06:16 AM, Brandon Long via mailop wrote: > > So, we've been doing dmarc rejects for many years, for Yahoo.com since > they went p=reject two years ago. > > We may sometimes override the rejection, but no one should rely on that. > > I don't know of anything that has changed recently about this. > > Forwarding doesn't break with this unless you modify the mail or the > original message wasn't dkim authenticated. We've seen some recent > examples of banks going p=quarantine while only doing spf auth, which > obviously doesn't survive forwarding. > > Brandon > > On Jun 15, 2016 1:57 AM, "Jeffry Dwight" <jeffry.dwi...@greyware.com> > wrote: > >> Sorry for the bad example. We don't use spaces when sending email out, >> although >> as Jon Postel would have approved, we accept them for incoming mail. >> There are a >> lot of broken MTAs out there. >> >> Jeffry >> >> --- Original Message --- >> From: <ml+mai...@esmtp.org> >> To: mailop@mailop.org >> CC: >> Date: Tue, 14 Jun 2016 20:23:36 -0700 >> Subject: Re: [mailop] change at gmail??? >> >> > On Tue, Jun 14, 2016, Jeffry Dwight wrote: >> >> > MAIL FROM: >> > RCPT TO: >> >> RFC 5321 SMTP October 2008 >> .. >> Since it has been a common source of errors, it is worth noting that >> spaces are not permitted on either side of the colon following FROM >> in the MAIL command or TO in the RCPT command. The syntax is exactly >> as given above. >> >> >> _______________________________________________ >> mailop mailing list >> mailop@mailop.org >> https://chilli.nosignal.org/cgi-bin/mailman/listinfo/mailop >> >> >> >> _______________________________________________ >> 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 > > > -- > > *--* > *Â Geoff Mulligan* > *Â Chairman LoRa Alliance* > *Â Founder IPSO Alliance* > *Â Former White House Presidential Innovation Fellow* > > > > _______________________________________________ > mailop mailing list > mailop@mailop.org > https://chilli.nosignal.org/cgi-bin/mailman/listinfo/mailop > >
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