Another day, another annoyance to complain about. This particular issue isn't related to gadgets, but e-mail is now one of the (if not THE) primary form of communication among individuals, and without technology, it wouldn't be the case.
Those in a corporate enviornment have no doubt encountered the e-mail read receipt, and probably send some or all messages requesting one yourself. Home users may not have ever had to deal with them since not all e-mail clients, particularly in the free online services, support them.
So what is a read receipt? For those who have never seen one, read receipts are a form of e-mail tracking. Quoth the Wikipedia: