Re: DMARC methods in mailman

S Moonesamy <> Wed, 21 December 2016 11:03 UTC

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Date: Wed, 21 Dec 2016 02:57:17 -0800
To: Philip Homburg <>,
From: S Moonesamy <>
Subject: Re: DMARC methods in mailman
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Hi Philip,
At 03:06 20-12-2016, Philip Homburg wrote:
>What about adding a checkbox in the mailman profile for subscribers of the
>lists that basically says: if you detect that the sender is using DMARC then
>please rewrite the From header.

There is already code in Mailman, e.g. if not 
(msgdata.get('from_is_list') ... to do the above.  The configuration 
can be set by AMS.

>People who receive the list on a yahoo account would have to mark the checkbox
>(though maybe a list of default domains can be hacked in such that new
>subscribers for those domain would get it set automatically)

The focus has been on Yahoo because of a message which was posted 
several years ago.  I collected some statistics for an IETF mailing 
list.  Approximately 40% of the subscribers are using [1] DMARC; most 
of then are not using Yahoo.

S. Moonesamy

1. This is not the percentage of subscribers using "p=reject".