REF: Exchnage 2010 Journaling agent are not list on Get-TransportAgent In an Exchange 2010 organization, all e-mail traffic is routed by the Hub Transport server. All messages traverse at least one Hub Transport server in their lifetime. The Journaling agent is a compliance-focused transport agent that processes messages on Hub Transport servers . It fires on the OnSubmittedMessage and OnRoutedMessage transport events. Note: In Exchange 2010, the Journaling agent is a built-in agent. Built-in agents aren't included in the list of agents returned by the Get-TransportAgent cmdlet. For more details, see Understanding Transport Agents .