Set the '$keepprivate' field in Javamail

I am using Javamail api to create an email report to be sent only within Notes environment (All the recipients are using Lotus Notes). I need this mail to be non-forwardable and non-copyable. Manually we can do this by setting the Prevent Copying flag in Delivery Options of Note client.

I need to do the same thing programatically. I understand that we need to set the ‘$keepprivate’ field to 1 to achieve this. Could someone please let me know how we can do this in Javamail. Any help highly appreciated.

Thanks,

Anuroop.