Just a record of changes for those of you who care about the infra:

* Updated postfix on lists to strip DKIM/ARC headers for incoming messages.

These get re-signed on the way out, and even when we have DKIM aligment to the new sig, some things don't like the old sig not verifying.

* Updated mailman to always do DMARC From mitigation

This will ensure we have DKIM alignment

This also updated several lists that were doing Wrap based mitigation to do From mitigation

* Updated SPF records

To remove unneeded rackspace IPs

* Updated our DMARC records

Added some missing fields, removed rua/ruf addresses we don't need, added rua/ruf address for mailgun.

* Updated DNS for lists.linuxfests.org

Added an MX, rather than falling back to A record

There's more to come, we need to move to enforcing our SPF/DKIM/DMARC policies, but I want to wait and make sure we're actually getting DMARC alignment first.