> On Aug 11, 2017, at 5:31 AM, Sim via dmarc-discuss <[email protected]> > wrote: > > Hi List, > > Person A sends an invite to person B, who forwards it to person C. > > If A's domain is on "reject" (or "quarantine"), B's MUA doesn't replace > the original "From:" and C's MTA checks for DMARC, this breaks - well, > works as designed. > > Outlook keeps the original "From" and this explains why sporadically, I > see our domains used by our partner's MTAs. > > Do you know of any other MUAs causing this kind of trouble (G-Calendar & > Lightning doesn't)? Any remediation possible? Or just accept to have > smaller meetings?
It's working as designed. Person A's domain owners do not want anyone to use that domain for normal, general purpose email. Either person A needs to stop doing that, person A's domain owners need to stop doing that or whoever configured the mailserver for domain C needs to modify it to take account of person A's domain owners having internally inconsistent policies. B's MUA could mitigate the damage by rewriting the From: field, but that will harm everyone's email experience, whether they were on domains affected by DMARC or not. That's not uncommon practice for mailing lists and some sorts of forwarding at the moment (though that change may be rolled back if ARC works to mitigate the DMARC damage in those scenarios). Cheers, Steve _______________________________________________ dmarc-discuss mailing list [email protected] http://www.dmarc.org/mailman/listinfo/dmarc-discuss NOTE: Participating in this list means you agree to the DMARC Note Well terms (http://www.dmarc.org/note_well.html)
