[UCIMC-Tech] Mailman 2.1.18? - DMARC: Yahoo vs internet mailing lists

[Stuart Levy]

Dear IMC Tech people,

I'm sorry to bother you again, but am wondering if you can help with 
this, or if I can, or both.

Having read last month that Yahoo's DMARC mail trust settings were 
breaking mailing lists including the IETF's own -
http://www.ietf.org/mail-archive/web/ietf/current/msg87153.html
... I wondered why it wasn't happening here.   Well, it is.

The effect is that, when a Yahoo user writes to an IMC mailing list 
which has other Yahoo users as non-digest recipients, all of them - 
sender and receivers - get bounce messages.   The receivers get fatal 
bounces which immediately suspend them from the list.   This is 
happening now.

There are workarounds for this in the latest version of Mailman, 2.1.18, 
released just this last weekend --

     release notes here:
https://mail.python.org/pipermail/mailman-users/2014-May/076787.html

     including this:

       [...] a new Privacy options -> Sender filters -> dmarc_moderation_action
       feature which applies to list messages where the From: address is in a
       domain which publishes a DMARC policy of reject or possibly quarantine.
       This is a list setting with values of Accept, Wrap Message, Munge From, Reject or Discard.
       There is a new DEFAULT_DMARC_MODERATION_ACTION configuration setting to set the
       default for this, and the list admin UI is not able to set an action
       which is 'less' than the default.

What would it take to get Mailman 2.1.18 on the chambana.net mailing 
list server?
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