It's well known and was discussed at length in June and probably several other times. I'm not sure it's even possible to be compliant given the currently used list software.

<https://lists.gt.net/clamav/users/72965?search_string=dmarc;#72965>

-Al-

On Wed, Oct 31, 2018 at 02:27 AM, Giuseppe Ravasio wrote:

Hi,
our mail relay recently started checking DMARC authentication of
messages and it turns out that this mailing list is braking DMARC.
That result in having rejected or quarantined messages from user whose
email TLD is specifyng a DMARC policy.

For the mailing list admins here there is a FAQ link about ML and DMARC
https://dmarc.org/wiki/FAQ#senders

Thanks
Giuseppe