Hi,
If you are calling the URL in external window you can pass the parameters HAS_TOOLBAR & HAS_LOCATION to abap_false.
Since you are sending the URL via email, I don't this there is a way to hide the URL parameters.
Again, if the URL is static ( not dynamic parameters ) you can create an Alias in the SICF. Check the procedure here under Defining an Alias Displaying Applications in the Browser (SAP Library - Balanced Scorecard (CPM-BSC))
Regards,
Kiran