I want to disable “Request delivery receipt” feature system wide, in Outlook 2007 working on exchange 2010 server.

Dear all.

I am using 2010 exchange server and outlook 2007 in client side, I want to disable a feature , from client side{out look 2007}, that is Users should not have an option to  request for delivery/read receipt, it should be disabled from appearing active in outlook 2007 , I think we can do it  with group policy or some thing like , I am not sure and I don’t know any exact steps in same , kindly help

Request delivery receipt               Request read receipt

Please, guide me on this, any thought sharing on this is also very highly appreciated .