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Okay Microsoft this is not how to start off 2022
Business patchers only – heads up
If you have an on premises mail server 2016 or 2019, heads up you have a problem and your mail isn’t running because the malware filter can’t parse the 2022 year date.
The workaround is
set-malwarefilteringserver -bypassfiltering $true -identity [name-of-exchange-server]
Yes that disables the malware filter, hopefully Microsoft comes up with a fix soon. Note hosted email is not having a problem. Only on premises email servers.
Exchange mail flow breaks (Disable AntiMalwareScanning) – ALI TAJRAN
Edit of 1/1/2022 10 a.m pacific: Still no official acknowledgement from Microsoft.
Edit 1/1/2022 11:48 pacific – Acknowledgement by Microsoft: (1) Email Stuck in Transport Queues – Microsoft Tech Community