Microsoft Exchange year 2022 bug in FIP-FS breaks email delivery
Microsoft Exchange Y2K22 bug
According to numerous reports from Microsoft Exchange admins worldwide, a bug in the FIP-FS engine is blocking email delivery with on-premise servers starting at midnight on January 1st, 2022.
FIX THIS FOR Exchange 2013/2016/2019
Set-MalwareFilteringServer -Identity YOUREMAILSERVERNAME -BypassFiltering $true