Outlook 2003: automatically checks read and delivery receipt buttt

Help!! I am ready to scream....

When I view the options in Outlook 2003, the request for read receipt and
delivery receipt boxes are unchecked. I open a new message, look at the
optoins again, everything's still a OK. I send the email, then boom, I get
both delivery and read receipts, and when I open the just-sent email, I see
that NOW the delivery and read reciept buttons are in fact checked...!! What
is going on?? I've never had this problem before..! It has been a few months
since I've used Outlook and the only other change is now I use Comast (as
opposed to yahoo) on a cable modem...

Please help!!!