On Fri, Aug 02, 2024 at 01:03:47PM GMT, Stephen Rothwell wrote:

As more and more sites are using DKIM signing or emails (and DMARC),
more and more of the list traffic is not being delivered due to Mailman
altering messages in subtle ways (so the DKIM signature is no longer
valid).  The easiest thing to do is to tell Mailman to munge the From:
address so that the messages come from the mailing list itself.  It
also adds a Reply-To: header with the original sender's address.

So a message from me to the list will now have

From: Stephen Rothwell via Linuxppc-dev <redacted>
Reply-To: Stephen Rothwell [off-list ref]

The only real downside to this (I think) is that if you take a message
from the list containing a patch and apply that to a git tree you will
have to fix up the Author appropriately.

Konstantin, I assume (hope?) that b4 may have some way of fixing the
authorship up?

Not really, for two reasons:

- X-Original-From is widely used, but isn't really a standard header.
- From-munging breaks end-to-end attestation, so we consider x-original-from
  and similar headers a potential impersonation attempt and ignore them.

I would generally say that From-munging isn't a great option for any list that
receives patches. A much better approach is to just not modify the message
headers or message body. This should be possible with mailman.

-K