I'll jump in here and offer the quick solution that I'm using at FMP. The primary culprit here is Yahoo, which publishes a DMARC p=reject policy via DNS. To the best of our knowledge, so far, no one else is doing this, although sbcglobal, att.net, comcast.net, Hotmail and a number of other email service providers will honor Yahoo's policy and bounce posts which have a yahoo.com address in the From header and come from an IP address which isn't a yahoo.com server. This is the case, as per relevant RFCs, for most mail from Mailman mailing lists.
What I'm advising list admins here, which puts a band-aid on the problem, is to put all yahoo.com subscribers on moderation, effectively making them read-only subscriptions. Also go through your membership list and clear any nomail disablements with a "[B]" beside them. We're also advising yahoo.com list subscribers to get a Gmail account (as free and easy to get as a Yahoo account) Mark or Stephen may have a more in-depth response to you, but this is how I've addressed the problem here. On Wed, 2014-04-16 at 11:30 -0400, Jose I. Rojas wrote: > We have a community group mail list which we run using Mailman and > have lately had a problem getting our emails to members who have > Bellsouth and Yahoo email addresses. I've seen the posts about DMARC > but am not that tech-savvy to figure out what this means and how to > resolve. Some of our members have complained that they are not getting > the group's emails. We have written Bellsouth but they claim the > domain is not on a blacklist and problem is not on their end. Our ISP > tells us domain is "RFC -compliant" and problem must be with Bellsouth > or Yahoo. How do we resolve this? What is the fix? Help, please... -- Lindsay Haisley | "Everything works if you let it" FMP Computer Services | 512-259-1190 | --- The Roadie http://www.fmp.com | ------------------------------------------------------ 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
