Custome mail rule reject message

Is it possible with R6 mail rules to customize the message people receive when their e-mail has been bounced. For example, I am not accepting any messages with exe, vbs, vbe, js, jse, wsh, and wsf attachments. The message the sender receives back simply indicates delivery failed and message rejected for policy reasons. Can that message be modified to reflect a more discriptive meaning?

Thanks,