[Bug Infrastructure/29713] Please make libc-alpha mailing list compatible with “git am”

["mark at klomp dot org" <sourceware-bugzilla@sourceware.org>]

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

--- Comment #37 from Mark Wielaard <mark at klomp dot org> ---
(In reply to Florian Weimer from comment #36)
> Asserting the non-existence of these headers is what breaks DKIM signatures
> with mailing lists. I reported this upstream-upstream here:
> 
>   Signed header defaults break mailing lists
>   <https://github.com/duncanthrax/pdkim/issues/4>

Thanks. There is also a Exim and Debian bug for this:
https://bugs.exim.org/show_bug.cgi?id=2394
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=939808

It looks like a workaround is to not rely on the default exim setting of the
dkim sign headers, but explicitly set it to:

DKIM_SIGN_HEADERS =
From:From:=Sender:Reply-To:Subject:Subject:Date:To:Cc:Message-ID:In-Reply-To:References:MIME-Version:Content-Type:Content-Transfer-Encoding:Content-ID:Content-Description:=Resent-Date:=Resent-From:=Resent-Sender:=Resent-To:=Resent-Cc:=Resent-Message-ID:=List-Id:=List-Help:=List-Unsubscribe:=List-Subscribe:=List-Post:=List-Owner:=List-Archive"

> If Exim (or pdkim really) are unwilling to fix this, Mailman (or something
> in front of Mailman) needs to be taught to strip such anti-mailing-list DKIM
> signatures.

The problem with getting this fixed seems to be that some people are convinced
dmarc and dkim will just break mailinglists always, so they don't see a point
in fixing the defaults.

Stripping can only be done if the dmarc policy for the domain doesn't require
DKIM signatures, otherwise we will either have to bounce them before they reach
the list or do From munging anyway (as suggested in comment #6).

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