It is already there and the ability to disable the option to not send a read receipt is also available if the network admin uses a GPO to disable this option. Only the truly determined will circumvent it and that is not a tech problem, it is an HR problem.
--
Milly Staples [MVP - Outlook]
Post all replies to the group to keep the discussion intact. All
unsolicited mail sent to my personal account will be deleted without
reading.
Thanks. we require staff to review email at least once per shift and
oftentimes it is good to know if the recipient has opened the mail so you
know they have either been properly informed for a current issue/problem or
that they are working on the issue for a pending reply. This is a really
good productivity feature, widely used in Groupwise, and it would be great if
it could be implemented in a future version.