Meanwhile . . .
Google crams everything and the kitchen sink in Gmail, but leaves Return Receipts to the "professional" (aka paying) version.
Return receipts. I've been using that in Lotus Notes since 1995, and I'm supposed to believe that this is "professional" functionality ?
I do believe that return receipts are simply a part of internet email specifications since email was invented.
So how's about you make yourself useful and make return receipts available for everyone ?