[SAC] DMARC/DKIM mitigation on maling lists

[Sandro Santilli]

As we know have a draft recommendation for mailing lists:
https://trac.osgeo.org/osgeo/ticket/3011#comment:23

Would anyone with admin access of this mailing list (sac) want to try
following those recommendations for this list ? That way we can verify
the instruction are clear and at the same time have broader test of
the recommended configuration.

Starting point:
https://lists.osgeo.org/mailman/admin/sac

Current administrators are: Hobu, me, Jeff McKenna and Regina, all in Cc.

--strk;