FYI, I'm intending to make this change tomorrow (Thursday Jan 16th)

On Fri, Jan 10, 2020 at 12:26:07PM +0000, Daniel P. Berrangé wrote:
> Hi List Subscribers,
> 
> In recent months we have been seeing an increasing number of bounced
> deliveries from libvirt mailing lists[1] due to DMARC policies on list
> subscriber's mail servers. IOW, many subscribers are only receiving
> a subset of mails sent to the libvirt mailing lists.
> 
> We believe the root cause of many of the problems is that mailman is
> modifying the mail subject to add the "[libvirt]" / "[libvirt-users]"
> prefix, and modifying the mail body to add the footer with links to
> the listinfo page.
> 
> These modifications invalidate the DKIM signatures on mails sent to
> the list by some of our subscribers. This in turn causes DMARC policy
> rejections by the destination SMTP servers when mailman delivers
> messages.
> 
> The solution is to disable any feature in mailman which modifies
> parts of the mail validated by the DKIM signature. This means removing
> the subject prefix and the mail body header. Further information on
> this approach can be seen here:
> 
>    https://begriffs.com/posts/2018-09-18-dmarc-mailing-list.html
> 
> QEMU has made the same change on their mailing list last year:
> 
>    https://lists.gnu.org/archive/html/qemu-devel/2019-09/msg00416.html
> 
> If you are currently doing mail filtering / sorting based on the subject
> prefix, you will need to change to use the List-Id header instead.
> 
> I will wait until the latter part of next week before making this change
> to allow people time to adapt any filters.
> 
> Regards,
> Daniel
> 
> [1] technically moderators have only been seeing bounces for messages on
>     libvirt-users-list, but that's because we've got mailman configured
>     to send libvir-list bounces to /dev/null.
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Regards,
Daniel
-- 
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