Some of the mails generated by gitlab are way bigger than 200KB, e.g.
this[1] Thunderbird package bump resulting in a 850KB mail. So bump t0
1000KB for now and see if it is enough.

[1] archlinux/packaging/packages/thunderbird@3da91c6e

It was brought to our attention by @foxboron, that arch-security is
misconfigured. It should only accept mails from members of the Arch
Security Team.

It is unclear if the list has always been misconfigured or if it
happened as part of mailman2 -> mailman3 migration.

All lists expect arch-mirrors-announce and aur-requests[1] require the
user to be a member before they can post. Moderating mails from
nonmembers are a lot of work and most of the mails are spam, so let's
just reject them. Mails to arch-mirrors-announce and aur-requests from
nonmembers will still be checked manually, as you aren't required to be
subscribed[1].

[1] https://wiki.archlinux.org/index.php?title=General_guidelines&oldid=750602#Reply_to_the_mailing_list

mkinitcpio moved from GitHub to gitlab.archlinux.org.
See #474.

With the final lists migrated to mailman3[1], the mailman2 server can
finally be killed.

When the mailman3 server was initially setup[2], it was done on a
separate server because the mailman and mailman3 packages conflicted,
and the traffic was routed over wireguard (HTTP, LMTP and SMTP).

Instead of installing mailman3 on the original lists.al.org server and
transferring the data, it was easier just to install the missing pieces
(basically Postfix and adjusting the Nginx configuration) on the ml3
server and move the IPs (to keep the IP mail reputation).

So basically the following was done:
- The IPs for the original lists.al.org was moved to the mailman3.al.org
  server
- The mailman2 datadir was transferred to mailman3.al.org server, so we
  can keep the pipermail links alive, and import missing mails if needed
- The original lists.al.org server was decommissioned
- The mailman3.al.org server was renamed to lists.al.org
- The missing pieces was added to the mailman3 role (basically Postfix +
  Nginx adjustments)
- The mailman role was deleted and the mailman3 role renamed to mailman

[1] 75ac7d09 ("mailman: Fourth and final batch of mailman3 migrated lists")
[2] 9294828f ("Setup mailman3 server")

Fix #59

The DNS is still pointing to luna.