1: Open Exchange management Console and browse to
2: Click on Transport Rules and select New Transport Rule in the action pane.
3: Enter the name of your new transport Rule, click Next.
4: Put a check in the box for "From users that are inside or outside the organisation", select inside or outside from the option below, click next.
5: Select "Set headers with Value"
6: Click on the 2 parameters below and set the header and the value, click Next
7: Click Next.
8: Click New.
9: Send a test and observe the header information in Outlook.