Emails from kvack.org going into spam

From: Jason Gunthorpe <jgg@ziepe.ca>
To: Jann Horn <jannh@google.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	linux-mm@kvack.org
Subject: Emails from kvack.org going into spam
Date: Fri, 16 Oct 2020 10:54:51 -0300	[thread overview]
Message-ID: <20201016135451.GB36674@ziepe.ca> (raw)

Does anyone know who is the admin for kvack.org?

I was cleaning my GMail spam mail box and saw lots of messages from
Jann Horn in the spam filter. Since he is not a spammer I investigated
what is going on.

I see it is because GMail is flagging all of Jann's messages as having
a DKIM failure and Jann's employeer domain 'google.com' is enforcing a
DMARC policy:

Authentication-Results: mx.google.com;
       dkim=neutral (body hash did not verify) header.i=@google.com header.s=20161025 header.b=UzPVodG7;
       spf=pass (google.com: domain of owner-linux-mm@kvack.org designates 205.233.56.17 as permitted sender) smtp.mailfrom=owner-linux-mm@kvack.org;
       dmarc=fail (p=REJECT sp=REJECT dis=QUARANTINE) header.from=google.com

Selecting a message from Jann that went through LKML and kvack:

  https://lore.kernel.org/lkml/20201015000041.1734214-1-jannh@google.com/raw
  https://lore.kernel.org/linux-mm/20201015000041.1734214-1-jannh@google.com/raw

And checking the DKIM:

  $ opendkim-testmsg < raw.lkml
  $ opendkim-testmsg < raw.mm
  opendkim-testmsg: dkim_eom(): Bad signature

Confirms that Jann sent the message correctly, but kvack is breaking
the signature while vger is not. The DMARC policy on Jann's email is
causing receivers to junk his email as spam. I expect I'm not the only
one.

I see that kvack is modifying the message in transit. Notably it
changed the transfer encoding from
 Content-Transfer-Encoding: 8bit
to
 Content-Transfer-Encoding: quoted-printable

And mangled the body accordingly. Changing the
Content-Transfer-Encoding definitely breaks the signature.

This seems to be a fairly big problem - it is extra hard for people to
contribute. Setting up a text based email flow is already hard, but
having to also somehow obtain an email address that doesn't use DMARC
is becoming an increasingly tough bar to clear.

eg what will people even do if/when Google decides to enable DMARC on
gmail.com as well?

Is it possible that this list software can be reconfigured to match
the vger lists that do seem to work OK?

Is moving the list to vger an option?

Thanks,
Jason