Do not use Return Receipt Request (RR) for each and every personal email you send because you like "knowing" when someone opens the email you sent to them. Not only is this an inconvenience pain for the recipient, this feature is annoying and intrusive! How would you like it if every time you heard a voice mail, answering machine message, or opened a postal letter from a friend it was immediately reported back to them that you had received their communications? The recipient should have the privacy to determine when and if they want to reply - period. Retrun Reciept should be reserved for those instances where it is critical to knowing the email was opened. Such instances would include legal and important business issues. Plus, keep in mind, opened doesn't mean read!