FYI, I'm intending to make this change tomorrow (Thurs Jan 16th)
On Fri, Jan 10, 2020 at 11:44:04AM +, Daniel P. Berrangé wrote:
> Hi List Subscribers,
>
> In recent months we have been seeing an increasing number of bounced
> deliveries from the mailing list due to DMARC policies on list
> subscriber's mail servers. IOW, many subscribers are only receiving
> a subset of mails sent to this list.
>
> We believe the root cause of many of the problems is that mailman is
> modifying the mail subject to add the "[virt-tools-list]" 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
> --
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>
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Regards,
Daniel
--
|: https://berrange.com -o-https://www.flickr.com/photos/dberrange :|
|: https://libvirt.org -o-https://fstop138.berrange.com :|
|: https://entangle-photo.org-o-https://www.instagram.com/dberrange :|
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