Go to an applet and click on F9 to send a email to creator or requestor, after selecting the recipient we get a email template which has body, attachment, Literature icons as well "Change Language/Locale" button.
Our requirement was to disable some of the controls from the email template.
Outbound communication use one common applet called as "Send Communication Applet", so to disable them go to that applet in tools, go to controls and inactive the controls which are not required, compile into the proper srf.