Email Stuck in Exchange On-premises Transport Queues

This was my fix that was the alternative fix.  - I have the way to reverse it too.  REPLACE SERVERNAME.DOMAIN.LOCAL WITH YOUR FQDNSERVERNAME

We used AppRiver for an email filter and did not use the Microsoft Spam filter in addition to the filtering process.  Test it and undo it if this does not work for you.

To break local email filtering do this, but it allows the emails to come through because the emails contain a date that cannot be recognized after 12312021

Run Exchange Management Shell as Administrator
Set-MalwareFilteringServer SERVERNAME.DOMAIN.LOCAL -BypassFiltering $true
Restart-Service MSExchangeTransport

To put it back do this
Run Exchange Management Shell as Administrator
Set-MalwareFilteringServer SERVERNAME.DOMAIN.LOCAL -BypassFiltering $false
Restart-Service MSExchangeTransport