how do i perform email commands in service desk plus pro?

how do i perform email commands in service desk plus pro?

I have the newest version of service desk plus pro and wish to perform email commands. I want to be able to send an email to myself ( jeffery.carlson@garrard.kyschools.us) and close a request. I created a sample request to close and it has request id 9 on it. Can someone please explain to me how this email command system works. Without email this system would become useless in our organization.
Heres my sample email code:
Subject:
@SDP@
Body:

@@OPERATION = CloseRequest@@

@@REQUESTID = 9@@
Also, i want to put a resolution down for it when im closing it.

                  New to ADSelfService Plus?