Wimpy disclaimer

I sent a message with a receipt request to some colleagues. The receipt returned by a colleague using the Mozilla project's Thunderbird email programcontains this disclaimer:

Note: This Return Receipt only acknowledges that the message was displayed on the recipient's computer. There is no guarantee that the recipient has read or understood the message contents.

I think that part of Microsoft's grand plan for world domination includes the ability not only to get any data from your computer, but also to tap into your brain to guarantee that you understand a message. Wimpy open source projects like Mozilla will never achieve this.