No doco, sorry. The list I run is a single sender announce list, so getting all senders to use the right options was practical for me.

IIRC the main change was to get mailman to rewrite headers so that messages came from the list address. Trying to keep the original sender caused some problem that I never got to the bottom of.

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Trapped in signature factory please send help

On 25 Sep. 2017 10:54 am, "Russell Coker via luv-main" <luv-main@luv.asn.au> wrote:
On Sunday, 24 September 2017 6:08:26 PM AEST Jason White via luv-main wrote:
> Arjen Lentz via luv-main <luv-main@luv.asn.au> wrote:
> > Do you have any docu on that?
> > That'd be great.
>
> Here's the official page:
> https://wiki.list.org/DEV/DMARC
>
> In my case, I turned off features of Mailman that modified the subject lines
> or bodies of outbound messages, thus preventing it from breaking DKIM
> signatures.

https://doc.coker.com.au/internet/dkim-and-mailing-lists/

That doesn't work.  Unless you can get everyone who sends to the list to use
the "relaxed" option you will have Mailman header munging breaking thigns.
Getting every sender to do things the way you desire isn't a viable option.

Mailman also sometimes rewrites the body for a different encoding.

I tried to get Mailman to pass signed messages through on this list, it wasn't
possible.

--
My Main Blog         http://etbe.coker.com.au/
My Documents Blog    http://doc.coker.com.au/

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