On 3/24/21 5:57 PM, Bryan Fields wrote:
On 3/24/21 8:44 PM, Michael Thomas wrote:
FWIW, nanog doesn't alter
messages. All lists have the option to follow suit.
It does.  There's a setting in mailman that's enabled for the nanog list.

dmarc_moderation_action (privacy): Action to take when anyone posts to the
list from a domain with a DMARC Reject/Quarantine Policy.

It's set to Munge From.

So if your domain had a reject policy on DMARC, nanog will munge the from:
header to be 'Your Name via NANOG'<nanog@nanog.org>.

Yes, the IETF list does that, for example. But NANOG's just not modifying anything is better, IMO.

But the larger point is that people should set p=reject and put the burden on mailing lists to adapt.

Mike

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