Unable to receive some mail from drupal.org mailing lists

lists.drupal.org is currently being migrated, so this may need to wait for that migration to complete, since I expect the migration to include DNS changes.

We don't manage these relays, but I'll report this upstream.

Everything looks correct on the relay side and the IP6 PTR exists:

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 1232
;; QUESTION SECTION:
;7.3.1.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.1.0.3.0.8.c.b.5.0.6.2.ip6.arpa. IN PTR

;; ANSWER SECTION:
7.3.1.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.1.0.3.0.8.c.b.5.0.6.2.ip6.arpa. 21600	IN PTR smtp4.osuosl.org.

If you can forward us the email in question, the OSL has offered to look through their logs but nothing is looking amiss with the relay.

I discarded the email already in mailman moderation queue, but if/when it crops up again I will preserve the full email so we can do more investigation.