Option to require ACK on moderated post

I'd like an option where all moderated e-mail requires
an ack from the
poster before the admin is notified. This would stop
99% of the spam/virii that I get.
The e-mail reporting to the user that the mail is
pending moderater approval could have an expedite link
or even an "oops" link, I didn't mean to send that to
the group.

Un-ack'ed mail should be discarded automatically --
especially if the "pending approval" message can't even
be delivered.