This is useful.
4.1.3.3. Mailing Lists
[RFC6377] provides some guidance on using DKIM with Mailing lists.
The following mitigation techniques can be used to ease
interoperability issues with DMARC and Mailing lists:
It should probably be indicated whether these techniques would be applied
to all messages, or only to messages sent from domains with a DMARC
policy other than "p=none". (I prefer the latter.)
...
o Configuring the MLM to "wrap" the message in a MIME message/rfc822
part and to send as the Mailing List email address. Many email
clients (as of the publication of this document), especially
mobile clients, have difficulty reading such messages and this is
not expected to change soon.
This seems like a quite elegant solution. I'm very surprised by the second
sentence - are these clients that have difficulty with many Content-Types
or is it a specific issue for message/rfc822?
Thanks
Brian