On Apr 26, 2014, at 7:58 PM, Paul Scott <[email protected]> wrote: > On Apr 26, 2014, at 4:40 PM, Franck Martin <[email protected]> wrote: > >> I’m not sure the original email from Paul Scott, was about him running a >> mailing lists, or something like this… >> >> So I think, it was best to put aside the mailing list issue and help him to >> solve his problem. Let’s focus on problem solving. > > Frank, > > You are right on the mark. The situation has nothing to do with a mailing > list, and were I running a mailing list neither DKIM nor DMARC would be an > issue here. > > What happens is that a user, say using Yahoo! Mail, sends an e-mail to > someone whose domain I host (pretend it’s example.com), and that someone > wishes their e-mail forwarded automatically to, say, Gmail. That is, > [email protected] pens an e-mail to [email protected] who wishes to pick > up mail on Gmail. In this case, the Gmail server rejects the forwarded mail > from example.com, not on the basis of DKIM, but on the basis of Yahoo! mail > DMARC policy.
Incorrect. DMARC policy = DKIM *or* SPF alignment. Since the From header ([email protected]) will align with the d=yahoo.com DKIM signature on the message, Gmail will pass the message on the basis of DKIM alignment. Test and see for yourself. I have p=reject on tnpi.net, so I am very familiar with cases where DMARC fails and basic forwarding is not one of them. > Straight away, this is a huge problem if one wishes the From: header to > remain unchanged (a reasonable expectation). It means, as I understand it, > that DMARC prevents such forwarding. I find this an unacceptable situation in > a reasonable scenario. DMARC does not prevent such forwarding. DMARC works just fine with such forwarding thanks to DKIM. DMARC also works just fine with email lists, which do the same thing, so long as the mailing list doesn't invalidate the DKIM signature. Matt _______________________________________________ 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)
