The MailJSPProvider JSPs are located in /var/opt/SUNWportal/portals/<portal_id>/desktop/default/MailJSPProvider/html directory.
The JSPs available in the html subdirectory under MailJSPProvider and their functionality are:
Displays a list of email headers.
Allows editing of channel preferences.
Displays error message when channel connection fails.
Persists changes to the user preferences.