Re: DMARC methods in mailman

S Moonesamy <sm+ietf@elandsys.com> Thu, 22 December 2016 00:26 UTC

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Date: Wed, 21 Dec 2016 09:52:51 -0800
To: Philip Homburg <pch-ipv6-ietf-3@u-1.phicoh.com>, ietf@ietf.org
From: S Moonesamy <sm+ietf@elandsys.com>
Subject: Re: DMARC methods in mailman
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Hi Philip,
At 08:09 21-12-2016, Philip Homburg wrote:
>The point of my proposal was to make an option per subscriber.

Ok.

>The most sane way to deal with systems that reject or otherwise discard mail
>that fails DMARC checks is to rewrite the From.

Ok.

>So the only sensible way forward is to have a per subscriber option.

A per-subscriber option makes matters easier.

>So is that one mailing list typical, or just a bunch of people who like to
>reject mail?

Alexey posted some statistics about all the IETF mailing lists at 
https://www.ietf.org/mail-archive/web/ietf/current/msg100242.html

That one mailing list is not typical.  I don't have access to the 
data at the SMTP level to comment about messages from the mailing 
list which are rejected by receiving mail servers.

>But apart from that, you are saying that for at least that one list, if
>you send a mail to the list with a 'p=reject' then 40% of the subscribers are
>not going to see that message.

No.  I am saying that 40% of the subscribers are receiving messages 
from the mailing list through mail systems which advertise DMARC 
policies for the domain names which those subscribers are using.

Regards,
S. Moonesamy