How can an automatic read receipt from any of the personal Gmail be set up so that the user gets notified whenever the other person reads email?

There are certain steps can be followed in order to achieve this:

• A server can be set up which is serving 1×1 pixel image to any of the requested URL. Record the entire URLs to the database.
• Create an identifier for every sent email then point It to the image server.
• In any case, when the user will open this email the image will be automatically loaded.
• In some of the cases, you might be asked to approve the loading of images.