I've tried never to hand write a sendmail.cf, to be honest - I doubt even the sendmail authors recommended being that brave :). And I haven't done all that much with dmarc beyond using it.

--srs
 

From: NANOG <nanog-bounces@nanog.org> on behalf of Brielle Bruns <bruns@2mbit.com>
Sent: Thursday, February 21, 2019 4:01 AM
To: nanog@nanog.org
Subject: Re: A Zero Spam Mail System [Feedback Request]
 
On 2/20/2019 1:22 PM, Matthew Black wrote:
> Have you ever created a sendmail.cf without using M4?

Well, that brought back memories I did not want to revisit.

You are going to make me want to take up drinking.

--
Brielle Bruns
The Summit Open Source Development Group
http://www.sosdg.org / http://www.ahbl.org