Mark Sapiro writes: > On 06/06/2016 03:10 AM, Karl Smith wrote: > > Recently, my CAMRA Members list (the biggest one with about 700 > > email addresses) has stopped sending me a bounce copy and has on > > two occasions rejected one of my messages and unsubscribed a > > large (apparently random) number of the members, including me one > > time.
> This could be a DMARC issue. Particularly if only around the time this > started, a user or users started posting From: a yahoo.com or aol.com or > other address with a domain publishing a DMARC p=reject policy or if you > have regular posters in any of the yahoo.fr, yahoo.jp or other 'foreign' > yahoo domains as these recently also started publishing a DMARC p=reject > policy. That's what it sounds like to me, too. And it could be *any* address, not restricted to yahoo.* or aol.com -- there are many corporate domains (especially banks etc) that publish p=reject, and I get the feeling that it's spreading (slowly so far, though). As Mark says, you're looking for somebody who just started posting, or restarted posting after a layoff of several months, about the time the bounces and unsubscriptions started. If you have access to the "host" or "dig" utilities, you can check yourself by looking at the users' addresses, taking only the domain (the part after the "@" mark), prepend "_dmarc.", and checking for a TXT record (see examples below using "host" if you're interested, if not, that's no sin :-). @Mark BTW yahoo.co.jp and yahoo.jp are not in that set (warning: black magic follows, except for Mark you are not expected to understand this but I'll explain if you want -- new thread please :-): $ host -t TXT _dmarc.yahoo.jp Host _dmarc.yahoo.jp not found: 3(NXDOMAIN) $ host -t TXT _dmarc.yahoo.co.jp Host _dmarc.yahoo.co.jp not found: 3(NXDOMAIN) $ host -t TXT _dmarc.yahoo.ne.jp _dmarc.yahoo.ne.jp descriptive text "v=DMARC1\; p=quarantine\; rf=afrf\; rua=mailto:[email protected]\; ruf=mailto:[email protected]"; $ host -t TXT yahoo.co.jp yahoo.co.jp descriptive text "v=spf1 include:spf.yahoo.co.jp ~all" My guess is that yahoo.ne.jp is used as the "canonical" domain for Yahoo! Japan's domain hosting service. Japanese Yahoo! users have mailboxes at yahoo.co.jp AFAIK. > > Note that I am not a computer or software expert and only use basic > > functionality. > > I can understand that and I am not unsympathetic, but even if you are > non-technical, it helps a lot to describe exactly what you see. We will > try to help, but at some point, the people who administer the Mailman > installation may need to be involved +1 to all Mark says here. So far Mark and I are reduced to guessing, we need more data. We do not blame the victim, but we do need your help as best you can give it to diagnose the problem. Sort of like a doctor working with a foreign patient -- you do your best, we do ours, and we'll work it out together. Steve ------------------------------------------------------ Mailman-Users mailing list [email protected] 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
