Updating mailman settings to avoid From rewriting

[Mark Wielaard <mark@klomp.org>]

Hi,

Currently the newlib, binutils, gdb-patches, elfutils-devel and
libabigail mailinglists rewrite the From header when a message is from
a (strict) dmarc domain. This is to avoid breaking the dmarc policy
and get bounces from such messages.

However this breaks applying patches posted to the list with git am
since the Author of the patch now looks like it has the mailing-list
email address. This also breaks some tools that use
patchwork.sourceware.org to run CI buildbot jobs (git pw however seems
to get it right, as does using b4 against inbox.sourceware.org).

glibc and gcc have been experimenting with new mailman settings to not
require From rewriting. Those settings make sure no (essential) Header
are changes, and no changes to the body of the message are made that
could invalidate any dkim signatures. These are the same settings used
by the FSF tech-team for lists.gnu.org. [*]

At the Cauldron it seemed this was working well and it was pointed out
that some CI bots can get the author of patches wrong for these lists
that use patchwork. Also people seemed to appreciate the change so
they could more easily apply all patches as is from the mailinglist.

So I am proposing we apply the following settings for these lists:

 - subject_prefix (general): (empty)
 - from_is_list (general): No
 - anonymous_list (general): No
 - first_strip_reply_to (general): No
 - reply_goes_to_list (general): Poster
 - reply_to_address (general): (empty)
 - include_sender_header (general): No
 - drop_cc (general): No
 - msg_header (nondigest): (empty)
 - msg_footer (nondigest): (empty)
 - scrub_nondigest (nondigest): No
 - dmarc_moderation_action (privacy): Accept
 - filter_content (contentfilter): No

Please let me know if there are any objections or concerns.

Also the newlib and gdb-patches mailinglists don't have an admin at
the moment. Could someone volunteer to act as list admin for these?

Cheers,

Mark

[*] https://sourceware.org/bugzilla/show_bug.cgi?id=29713