When we restart the transport service (MSExchangeTransport) it again stops in few seconds because of which mail flow (incoming & outgoing) was out of service. Upon checking the Event Viewer I found the below error with an Event ID 16023.
Based on the below error snapshot, I noticed that “Microsoft.Exchange.Transport.Agent.MalwareApp.dll” file located under “C:\Program Files\Microsoft\Exchange Server\V15\TransportRoles\agents\Antimalware” directory could not be loaded with an Access Denied.
Solution
Should be applied on all the Exchange Servers 2016
Go to C:\Program Files\Microsoft\Exchange Server\V15\TransportRoles\agents
Right Click Antimalware, then go to Security (tab) the Select NETWORK SERVICE and give Full Permission.
