I too am in this boat. I am not concerned about delivery receipts so much as read receipts. On Outlook, I have the option to send a receipt or not when I open a message. On the Blackberry, not only am I not informed there is one attached but it sends the read receipt without my consent.
If this wasn't a significant issue, Microsoft would not have set the default behaviour in Outlook to ask first.
A lot of this discussion looked like it was centered on BIS. I am on a BES and there is no option related to receipts in my mail options window.
I rarely do this but I have to rant. It is so annoying when people say things like "....if you don't like it, don't use it..." (like someone in this thread said). I seriously doubt RIM considered the way this situation might evolve. There is no way most people would know about this obscure behaviour prior to purchase. Furthermore, it appears that certain models and OS's have certain levels of control for this. RIM must have known people wanted to address the option.
Like many others, I paid hundreds of dollars for this device and I'm locked in a contract. The privacy complaints, although not a major concern for me, are realistic. Imagine if every email you sent/read from whatever service you used was tagged with a receipt. Speaking only for myself, now I have to be aware that if I open a message from certain people I work with who are particularly paranoid and I choose not to deal with it for one or two days, they can track a time line. Annoying at best. So, I hereby add myself to the list of complaining users.
The link presented takes your to main Blackberry site. I wouldn't mind sharing my opinion but I don't know if I can find the place to do it??
(hope that was respectable ranting)