NANOG List posts and DMARC

John Levine johnl at
Tue Aug 2 20:31:46 UTC 2022

It appears that Michael Thomas via NANOG <mike at> said:
>On 8/2/22 12:30 PM, Jim Popovitch via NANOG wrote:
>> It's been doing it for ages for p=reject, but not p=none (the latter
>> being Jared's situation)

I don't understand Jared's concern.  His DMARC policy, like mine, is p=none
which tells receivers to do nothing DMARC-y with our messages.  I don't get
any sort of blowback from nanog posts that I can recall seeing.

>I'm sort of surprised that an org would have p=reject when its users use 
>outside mailing lists. 

Unfortunately, we lost that battle a long time ago.  It's "more secure" and
"best practice" so go away.


More information about the NANOG mailing list