I have used this feature in daily work with Lotus Notes many times and it was very usefull to me!
Completely self-contained systems like Lotus Notes and Microsoft Exchange, where the developer builds both the servers and the client applications using their own protocols and methods, can implement features such as true "return receipt". Internet mail, as I said, has no such feature mandatory, so email clients that use standard Internet mail cannot enforce such receipts. If you want "return receipt" as a feature, you will have to use Notes or Exchange.
So the community seems to have had bad experience, I have to wait for Apple to pass it through into mail and so long take the roundabout way ;-(
Sorry, I have no idea what you mean by this.
Regards.