To leverage the exception handling provided by the ESB toolkit, Below are the steps
Add the exception block to your Orchestration
Add the code as in the snapshot inside the exception block
When the exception occurs, this block would publish the faultmsg to message box
By default, All fault messages are picked up by the send port “ALL.Exceptions” which populates the ESBExceptionDb. This can be viewed in ESB Management Portal
If you do not want this behavior, then you would have to subscribe the fault messages using “Application” or similar property and handle it in either sharepoint or any other custom mechanism.