Is there a way on GMAIL that I can tell when someone opens an email?

Like when they receive it, and the moment they actually open it.





How can this be done?

Is there a way on GMAIL that I can tell when someone opens an email?
No.





Receipts can be requested (if you use Gmails SMTP server rather then the web interface), but are ignored by almost every client.





Webbugs can be embedded (ditto), but most clients block remote images, so these don't work. They are considered by many to be an invasion of privacy too.