Hatte folgendes Problem mit TrendMicro und in dem Zuge was über die Transportagents gelernt:

https://success.trendmicro.com/solution/1097474-unable-to-start-exchange-transport-service-after-uninstalling-scanmail-for-exchange-smex-or-messag

get-transportagent
Uninstall-TransportAgent -Identity "ScanMail Routing Agent"
Uninstall-TransportAgent -Identity "ScanMail SMTP Receive Agent"