On 12 Apr 2014, at 9:28 pm, "Mark Sapiro" mark@msapiro.net wrote:
Additional reading at http://www.dmarc.org/faq.html#s_3, http://blog.threadable.com/how-threadable-solved-the-dmarc-problem and http://www.spamresource.com/2014/04/run-email-discussion-list-heres-how-to.h... and other articles linked from those.
From the threadable article: “He recommends that all list administrators immediately stop delivering to Yahoo addresses to limit damage, and encourage members to move to a more friendly provider."
How would not delivering to yahoo addresses help? I thought the problem was with delivering yahoo email to others.
See Jim P's post in this thread at https://mail.python.org/pipermail/mailman-users/2014-April/076383.html and the branch linked therefrom, although you probably don't have the access required to install it.
Jim P's approach is to reject any post From: a domain with a DMARC policy of reject.
To accept a post and then not deliver it to some because you know it won't be accepted is arguably wrong, and also, you can't know except by experience which recipient domains will reject the post for DMARC policy. I've seen the following:
But note that the part of the threadable article I quoted talks about not *delivering* to yahoo addresses. I would thought that shouldn't be a problem.
Peter Shute