[dns-operations] Mailing List Behaviour Change

Jim Popovitch jimpop at domainmail.org
Sun Mar 31 22:32:41 UTC 2019

On Sun, 2019-03-31 at 17:16 -0400, Matthew Pounsett wrote:
> This message is crossposted to multiple lists. Apologies to those who see it
> more than once.
> DNS-OARC administrates many public mailing lists in the DNS operations space.
> Beginning on Wednesday, April 3, 2019 at approximately 20:00 UTC, OARC will
> change the way all mailing lists handle mail from subscribers in
> DMARC-protected domains.  For any such email with a 'reject' or 'quarantine'
> policy, we will begin wrapping the message in a new email with From and
> Reply-To headers set to the list address.  This is required to prevent email
> from DMARC-protected domains being bounced by destination mail servers.

It's about time. ;-)  There really shouldn't be any problem in doing this,
many other lists have been doing this for a few years now, without issue.

Might I suggest that you also wrap messages with a p=none policy.  Per the
spec, p=none is for testing, but  that doesn't mean "do nothing".  Wrap the
p=none messages so that those senders too will see how DMARC impacts them.

-Jim P.

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