On Mon, Apr 14, 2014 at 7:28 PM, Larry Stone <lston...@stonejongleux.com> wrote: > > On Apr 14, 2014, at 5:51 PM, Jim Popovitch <jim...@gmail.com> wrote: > >> On Mon, Apr 14, 2014 at 3:16 PM, Lindsay Haisley <fmo...@fmp.com> wrote: >>> So what is being said here? >> >> When a yahoo poster sends an email to your list, that email is >> reflected to the rest of the other subscribers. Those other >> subscribers may or may not check yahoo's dmarc policy before accepting >> your list email. If they do reject your list message, then that >> equals 1 mailman bounce. After a few posts from yahoo members, the >> bounce scores increase and the other subscribers are unsubscribed. > > I think most of us are clear on that point. Where I’m confused (and I’m > thinking that’s what Lindsay is asking about) is where you said > >> Yes! (maybe start reading threads from the bottom up?) :-)
Ahh, my "Yes!" post to Joe was because earlier in the day I had stated one thing about dmarc, and then Mark corrected me, and at that time I acknowledged Mark's correction. And then along comes Joe the next day, and he replied to my incorrect statement before he read my later post. In threaded message format, the bottom post would generally be the latest post, thus my comment. Back to DMARC, one thing that wasn't clearly stated earlier, wrt DKIM+SPF, Mailman "breaking" the DKIM because of header+body modifications. Whether or not a remote dmarc validation checks the SPF record (of the From: address) is dependent on the posters dmarc aspf setting (which *may* tell receivers to honor the poster's DKIM *and* SPF record). So even passing the DKIM signed portion, unfettered, may still fail dmarc checks at a receiver, resulting in bounces (and of interest to privacy advocates, the failed dmarc check will most likely send a copy of the post onward to various other organizations listed in the dmarc rua and ruf records). The only true ways to handle dmarc messages (imho) are to reject posts where the poster's domain clearly says to not forward (i.e. p=reject)... OR... totally wrap the poster's email as an attachment and change the From: to something under control of the mailinglist that is sending the email. -Jim P. ------------------------------------------------------ Mailman-Users mailing list Mailman-Users@python.org https://mail.python.org/mailman/listinfo/mailman-users Mailman FAQ: http://wiki.list.org/x/AgA3 Security Policy: http://wiki.list.org/x/QIA9 Searchable Archives: http://www.mail-archive.com/mailman-users%40python.org/ Unsubscribe: https://mail.python.org/mailman/options/mailman-users/archive%40jab.org
