Richard Damon writes:

 > The sender doesn’t need an actual DMARC policy, just send it in a
 > way that would pass the basic checks.

Which was what I said, no?  Except that I listed out the requirements
to pass the basic checks.

I'm not sure what your point is.  We know that sites, including big
sites, are giving spam points to messages that pass neither SPF nor
DKIM, and some (Gmail) even require From alignment for sites that have
a p=none policy (Gmail, itself).  We don't need to know why, we just
need to tell Mailman admins how to configure their MTAs.  And in the
case of Gmail's stealth from alignment requirement, Mailman itself
added a mitigation to recent releases.

Steve

-- 
GNU Mailman consultant (installation, migration, customization)
Sirius Open Source    https://www.siriusopensource.com/
Software systems consulting in Europe, North America, and Japan
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