Last modified: 2014-05-27 19:26:51 UTC
Try to become more DMARC-complient on the mailing lists to improve deliverability, particularly given Yahoo and AOL recently switched to a policy p=reject, preventing these users from sending emails to the mailing lists. This bug is partly wontfix since this is linked to an upstream Mailman for a proper resolution, but could be partly mitigated by changing some configuration parameters, although there is no proper solution. I open this bug partly to isolate this mailing lists issue from other DMARC-related bugs (56414, 59731, 64795), and properly tracking the issue. Two mitigations: 1/ http://www.spamresource.com/2014/04/run-email-discussion-list-heres-how-to.html is a way to mitigate the issue, although the main point is to change the From: header to a fixed address like wikitech-l@lists.wikimedia.org (quite disruptive for all users). 2/ http://www.ietf.org/mail-archive/web/ietf/current/msg87176.html proposes to rewrite Yahoo (+AOL) sending addresses from someone@yahoo.com to someone@yahoo.com.invalid to bypass DMARC.
(In reply to Seb35 from comment #0) > This bug is partly wontfix since this is linked to an upstream Mailman for a > proper resolution Can you link or file it (on launchpad)?
Apart http://dmarc.org/faq.html#s_3 which is only theoretical, I found this announcement of some support for DMARC in Mailman 2.1.16 and 2.1.18 (released April 18, 2014): http://wiki.list.org/display/DEV/DMARC If I understand correctly, the introduced config parameter from_is_list is now on a per-list basis; this one rewrite the From: header (RFC 5322) with "Sender via the list wikitech-l" <wikitech-l@lists.wikimedia.org>, or could wrap the message as a sub-part in a MIME message.
Reply-To is unaffected, which is good (we use reply_goes_to_list). https://bugs.launchpad.net/mailman/+bug/1313010 Probably better wait for https://bugs.launchpad.net/mailman/+bug/1315970 at least.
I think we'll wait for upstream here, or rather on bug 64547 (Mailman 3). Hence setting low priority.
