Having issue with mail delivery since 01/01/2022?
This is a confirmed issue related to mail delivery bug as Microsoft exchange server were having issue after the “Microsoft Filtering Management service” was stopped. Service starting that “Cannot convert ‘220101001’ to long.” Error began appearing after the “MS filtering Engine update”
Long Story short, Here is a work around.
use this command to disable MalwareFiltering
Set-MalwareFilteringServer -Identity <mailbox server> -BypassFiltering $true
Restart -service MSexchangeTransport
After Restart service you are good to go.. Mail start delivering
More Information here is Link : https://www.bleepingcomputer.com/news/microsoft/microsoft-exchange-year-2022-bug-in-fip-fs-breaks-email-delivery/