[Mailman-Developers] Adding DMARC support for Mailman 3

[Franck Martin]

----- Original Message -----
> From: "Stephen J. Turnbull" <stephen at xemacs.org>
> To: "Franck Martin" <franck at peachymango.org>
> Cc: "Mailman Developers" <Mailman-Developers at python.org>
> Sent: Monday, July 8, 2013 2:01:43 AM
> Subject: Re: [Mailman-Developers] Adding DMARC support for Mailman 3
> 
> Franck Martin writes:
> 
>  > If the From: contains the posting email of the mailing list, one
>  > would think that the default becomes reply to the list, but this is
>  > where Reply-To: can be used.
> 
> Most users do not display Reply-To; many cannot (at least not at their
> level of technical skill).  This means that they get no indication of
> the author of a message unless the author signs the body of the mail,
> which often isn't done, and is impossible to enforce.  So this setting
> is simply unacceptable except on announce/advertising lists (where
> Reply-To is usually set to some other address anyway) and on anonymous
> lists (which as far as I know are relatively rare).
> 
> If this option becomes a popular filter on large mail hosts,
> discussion lists (ie, the kind of mailing list that Mailman was
> originally intended to serve) will take a severe, perhaps fatal, blow.

This is speculation, and broad fear of the future...

The current practice for a postmaster is to trust (or not) emails from specific mailing lists, not who post them to the list. Adding DKIM to the list and taking ownership will only improve it. 

> 
>  > I hope this helps alleviate concerns.
> 
You should really read the code of the patch for MM2 and try it.