So here's a nice surprise, apparently, exchange is reporting an error Can't Convert "2201010001" to long this morning. As of Jan. 1, 2022 0:00 UTC on-premises Exchange servers seem to freezing transport of all emails – a date can't get converted. Here is a quick overview of what is going on.
To resolve this, for now, disable the anti malware-
& $env:ExchangeInstallPath\Scripts\Disable-Antimalwarescanning.ps1
