[AusNOG] Zoho Mail - SPF & DKIM Records...

[Andrew McN]

It's partly also due to design decisions in the mailing list software,
and to some extent MUA software.

If the list didn't munge the Subject header (inserting "[AusNOG]") and
put a footer under your message with the list details, then the DKIM
signature would remain correct, and therefore DMARC would be OK.

If mail clients did a better job of telling us about stuff that's in the
List-* headers, we might not feel the need to munge the Subject and Body
to insert details about the list.

Regards,
Andrew


On 26/11/16 15:00, Jeremy Visser wrote:
> On Fri, 25 Nov 2016 at 07:27 Christian Heinrich wrote:
> 
>     You might also want to consider DMARC too after you have configured
>     SPF and DKIM
> 
> 
> Not if you want to participate on this mailing list.
> 
> Unlike SPF, which only authenticates the envelope sender, DMARC enforces
> the correct servers for the "From" header as well.
> 
> This means if you participate in a mailing list that doesn't set
> dmarc_moderation_action to "Munge From" like, say, AusNOG which runs an
> outdated version of Mailman that doesn't support the feature, you will
> find your messages start to get marked as spam in the inboxes of users
> of DMARC–respecting mail services (like, say, Gmail).
> 
> This is due to a fundamental design of DMARC. This means your choices
> are to either (a) only participate in mailing lists which are willing to
> munge your From address, or (b) don't set a "reject" or "quarantine"
> policy in your DMARC settings (which kind of defeats the point).
> 
> 
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