We have had repeated reports over the past weeks of delivery failures, particularly at Gmail but it’s possible it affects mail delivery across the board.
Update, 2022-12-05: we are deploying emergency workarounds, see issue tpo/tpa/team#40981 for progress updates.
Update, 2022-12-14: DMARC, SPF records and DKIM signatures on outgoing mail hosts deployed, reputation improved. May impact negatively users not using the submission server.
Update, 2022-12-15: mail services considered restored, see TPA-RFC-45 or further improvements.