How can I remove Exchange Server Toolbox from the email processing chain?
You have two options to remove Exchange Server Toolbox from the email processing chain. Either uninstall the Exchange Server Toolbox or use these two commands in the Exchange Management Shell:
After that restart the MSExchangeTransport service. To enable processing again, use the same commands and swap the beginning with "Enable-TransportAgent [...] ". With "Get-TransportAgent [...]" you can check the current status.