[SAC] [OSGeo] #3011: Write recommendation for mailing list configuration regarding DKIM/DMARC/SPF

[OSGeo]

#3011: Write recommendation for mailing list configuration regarding
DKIM/DMARC/SPF
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 Reporter:  strk              |       Owner:  sac@…
     Type:  task              |      Status:  new
 Priority:  normal            |   Milestone:  Unplanned
Component:  SysAdmin/Mailman  |  Resolution:
 Keywords:  dkim, spf, dmarc  |
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Comment (by lnicola):

 Some more thoughts on this, which I've mentioned in an email before:

  - rewriting the sender is really annoying because mail clients tend to
 add the wrong name to the address book
  - it looks like Mailman prefers to strip the incoming DKIM signature;
 ours preserves it, but adds a Sender header, which invalidates the
 signature
  - stripping and re-signing is a valid option
  - the postgresql.org list manager is able to pass DKIM through just fine
  - we and postgresql.org send List-Unsubscribe headers, but some email
 clients don't like those
  - ideally (under RFC 8058), we'd have a List-Unsubscribe-Post header and
 DKIM-sign both to support the one-click thingy; of course, we have no DKIM
 at all
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Ticket URL: <https://trac.osgeo.org/osgeo/ticket/3011#comment:7>
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