When you send an email how do you confirm if it has been opened
When you send an email how do you retract it before it is opened
Really, you can't. There are read reciepts that can be turned on when sending emails, but many mail clients ignore them by default now, and many don't respond to clicking Yes the read it after reading them either.
Outlook has the option to retract an email, but that doesn't mean the person you sent it to, will allow it to be retracted before they read it.
Retrieving data ...