The sender domain has a DMARC Reject/Quarantine policy which disallows sending mailing list messages using the original "From" header.
To mitigate this problem, the original message has been wrapped automatically by the mailing list software.
--- Begin Message ---On 18.02.21, 05:15, "openwrt-devel on behalf of Sam Kuper" <openwrt-devel-boun...@lists.openwrt.org on behalf of sampabloku...@posteo.net> wrote: > On Wed, Feb 17, 2021 at 02:47:57PM +0100, Etan Kissling wrote: > > On 08.02.21, 10:33, Rosen Penev wrote: > >>> My patches don't end up in Patchwork for some reason. > >> It's because of DMARC. [..] > > > > Thanks for the hint about DMARC leading to Patchwork issues. [..] > > > > It seems that the OpenWrt mailing list breaks the signature by adding > > the 'openwrt-devel mailing list' footer. > > IIUC, the OpenWrt mailing list software (Mailman 2.1.29, last time I > checked) does not "break the signature". > > Instead, it wraps the original message and modifies the "From:" header > before distributing the mail to list subscribers. That wrapped message > is then (either by Mailman or by the MTA, I'm not sure) provided with a > new signature that is valid for the domain in the new "From:" header. Thanks for looking into this! You are right, sorry for not being clear enough. The wrapping is the workaround to avoid breaking the signature. However, it is also possible to just forward DKIM messages as is (no changes to From, Subject, Body). In that case, the footer would have to be removed. This only works with DKIM present, it doesn't when DMARC and SPF are used but no DKIM. Not sure how popular that problematic combination is, though. This blog post adds some more background as well: https://begriffs.com/posts/2018-09-18-dmarc-mailing-list.html Either variant should work: - Wrapping of the message (openwrt-devel behaviour) - Mangling 'From' header (dnsmasq-discuss behaviour) - Keep From / Subject / Body as-is (netfilter-devel behaviour) On openwrt-devel the empty subject, loss of thread hierarchy in the web archive as well as Patchwork problems seem to arise. Hoping that the fix for empty subjects will make Patchwork problems go away. On dnsmasq-discuss _sometimes_ the message still ends up in junk, especially when it goes through moderation queue (e.g., long message). I don't think they use Patchwork, so not sure how Patchwork likes the mangled from headers and subject line prefix that they add. On netfilter-devel, I never had any problems regarding junk filtering or Patchwork. Linux kernel mailing lists can feel a bit slow sometimes but it does not seem to be related to email authentication. Authentication-results: apple.com; spf=pass smtp.mailfrom=netfilter-devel-ow...@vger.kernel.org; dkim=pass header.s=20180706 header.d=apple.com Cheers Etan
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