Re: Enable dmarc mitigations

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Kevin Fenzi writes:
 > On 4/30/19 4:46 AM, Vitaly Zaitsev wrote:
 > > Hello all!
 > > 
 > > Currently Fedora mailing lists use "From" field from original messages
 > > and if sender's domain use DMARC=reject policy, mailing lists
 > > subscribers cannot receive any messages from such users because their MX
 > > servers follow DMARC procedure and drop them.
 > 
 > Which explains why DMARC is horrible. ;)

No, it explains why p=reject domains that post to mailing lists are
horrible.  DMARC is a good thing when used properly.

 > > Previously I opened ticket in Fedora Infra[1].
 > > 
 > > Someone need to fix this because more and more mailing servers starts
 > > enforcing DMARC=reject.
 > 
 > Which means more and more things break...
 > > 
 > > [1]: https://pagure.io/fedora-infrastructure/issue/7737
 > 
 > I guess I will enable the From field mitigation for this list, but I
 > will not like it. ;)

It's possible to do this only for domains that advertise p=reject.
They deserve what they get.

If there are any issues that seem like they can be addressed in
upstream GNU Mailman (unfortunately, we don't carry a stick big enough
to convince blockheaded mail domains not to publish p=reject), let me
know and I'll push it with the Mailman devs.  No promises, of course.

Steve
GNU Mailman
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