I'd scrawled..
> The W3C mailing list manager (MLM) is apparently configured to do
> rfc5322.from field re-writing which seems to ameliorate the DMARC-MLM
> issues (in my experience, at least), and it would be helpful if the IETF
> would take similar measures.
just fyi, I double-checked and I was incorrect regarding what the W3C
MLM is doing -- it is actually "doing as little as possible", wrt
message modifications, when sending email to list subscribers. Thus
there is greater likelihood of DKIM and SPF signatures remaining valid.
the mailing lists I was apparently thinking of, that are doing From:
field rewriting, are @lists.mozilla.org ones.
part of the reason for my re-surfacing the DMARC issue wrt @ietf.org
lists is that apparently my work MTA is bouncing msgs for
DMARC-protected domains (with p=quarantine or p=reject) that do not
validate, and the @ietf.org MLM then disables my subscription to the
mailing list in question (sigh. at least it notifies me).
although I have not sent email to the mozilla lists from my
dmarc-protected work address (AFAIK), I do note that I have not (AFAIK)
received any disable/unsubscribe notifications from @lists.mozillla.org,
and there have been folks posting to those lists from e.g. @google.com
(p=reject,pct=100), so perhaps the From-field rewriting they are doing
is "working" (for some definition of "working").
HTH,
=JeffH