You might want to check your boxes today - the Malware Scanning service can't handle 2022 dates and is crashing causing issues with mail flow.  
Disable with .\Disable-AntiMalwareScanning.ps1 script in the $exscripts directory and restart the transport service to fix until Microsoft patches the issue.
You're welcome.
	
		
			
		
		
	
				
			Disable with .\Disable-AntiMalwareScanning.ps1 script in the $exscripts directory and restart the transport service to fix until Microsoft patches the issue.
You're welcome.

 
	 
  
 
		 
 
		 
 
		 
 
		