Read receipts are great because they show that your email has been read. They're especially useful when the email topic is time-sensitive or important. The app allows you to always receive read receipts. Here's how to enable that function:
1.Tap the Nav icon at the top left corner of the Nav Bar to display the Navigation Drawer.
2.Tap the Gear icon at the bottom of the Navigation Drawer to bring up Settings.
3. Tap Mail.
4. Under the Compose section, tap the Always Request Read Receipt box
Note: The recipient must approve sending the receipt to you by tapping OK when notified that you are requesting a receipt. If the recipient declines to send the acknowledgement, you will not receive a receipt.