I don't know why I am having such a difficult time finding this. I just went through my sent items folder and see it littered with delivery confirmations and read receipts that mail has been sending out when I get stuff. How to I disable this from happening? I don't want to allow any delivery confirmations or read receipts. Searching seems to indicate that Mail does not work with return requests, but I see them in my sent folder so I'm confused. 
Thanks.
Thanks.