[Mozilla Enterprise] ESR mailing list forwarding gives rise to DMARC "failures"

[Paul Kosinski]

I've been getting various DMARC "failure" reports from some recipients'
email servers (see example below). I thought this kind of problem had
been solved a while ago, given DMARC having become fairly widespread.

Is this due to a few lame email servers not properly implementing DMARC
checking, or does the ESR list forwarding mechanism need improvement?

P.S. What follows is the text part of the email, I can supply the
(almost endless) headers if that would be helpful.

----

From: postmaster at bnb.gov.br
To: postmaster at bnb.gov.br
Date: Thu, 11 Jul 2019 21:06:43 -0400 (EDT)
Subject: DMARC Failure Report for iment.com (mail-from=enterprise-bounces at mozilla.org, ip=63.245.210.104)

This is an email abuse report for an email message received from IP 63.245.210.104 on Thu, 11 Jul 2019 22:06:41 -0300.
The message below did not meet the sending domain's DMARC policy.
For more information about this format please see http://tools.ietf.org/html/rfc6591 .

From: Paul Kosinski <mozilla at iment.com>
To: enterprise at mozilla.org
Sender: "Enterprise" <enterprise-bounces at mozilla.org>
Date: Thu, 11 Jul 2019 21:06:01 -0400
Subject: Re: [Mozilla Enterprise] Mozilla FF ESR - Slack Support Group?