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From: Kyle Meyer <kyle@kyleam.com>
To: Liam Hupfer <liam@hpfr.net>
Cc: misc@inbox.kyleam.com
Subject: Re: From header mangling for some debbugs mail to yhetil.org
In-Reply-To: <877cchtb9p.fsf@hpfr.net>
References: <877cchtb9p.fsf@hpfr.net>
Date: Sat, 17 Aug 2024 00:39:18 -0400
Message-ID: <87mslb69vt.fsf@kyleam.com>
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Liam Hupfer writes:

> Hi Kyle,
>
> Thank you for hosting yhetil.org! public-inbox is genius and piem is a
> great interface. Fortunately for me, we seem to have similar tastes in
> software, so I benefit from most of the lists you mirror.

You're welcome.  I'm glad to hear you find yhetil.org useful.

> I noticed some messages involving debbugs end up with =E2=80=9Cvia <list =
name>=E2=80=9D
> in the From header, but not others.

My understanding is that this From rewriting is due to how the admins
have configured Mailman.

  https://docs.mailman3.org/projects/mailman/en/latest/src/mailman/handlers=
/docs/dmarc-mitigations.html

Here's a previous discussion related to this on guix-devel:

  https://yhetil.org/guix-devel/87pn2kyo2c.fsf@kyleam.com/T/#u

> As far as I can tell, these rewritten From headers don=E2=80=99t show up =
in
> the archives at lists.gnu.org or debbugs.gnu.org.

I don't know what the underlying setup is there, but my guess is that
those services get the messages before the rewrite.  yhetil.org receives
messages as any regular list subscriber would.

If you look through other archives (e.g.,
<https://www.mail-archive.com/bug-guix@gnu.org/>), you'll spot some
"via" senders.

> It seems to mostly correlate with senders, but not always, e.g. [-f:via
> f:geerinckx] with and without the leading `-' both show results, although
> there seems to be a shift towards =E2=80=9Cvia=E2=80=9D around 2019 in th=
e case of this
> sender, with some overlap.
>
> Do you know what=E2=80=99s going on here?

Not with any confidence, but I suspect the sender is using a different
configuration/setup when sending the non-via messages than when sending
the via messages.  Here's some support of that:

  # with via
  $ curl -fSsL -d '' 'https://yhetil.org/guix-bugs/?q=3Df%3Avia+f%3Ageerinc=
kx&x=3Dm' | zcat | grep -c 'DKIM-Signature:'
  455

  # without via
  $ curl -fSsL -d '' 'https://yhetil.org/guix-bugs/?q=3D-f%3Avia+f%3Ageerin=
ckx&x=3Dm' | zcat | grep -c 'DKIM-Signature:'
  0