Outlook has this sort of thing, but the receiver sees the notification and has to accept it. Which is always a clear sign to me that someone sent something out

Outlook has this sort of thing, but the receiver sees the notification and has to accept it. Which is always a clear sign to me that someone sent something out and then thought better of it, so I always look extra-closely at the email in question. Anyway, if people didn't accidentally send stuff like this, cnn.com and other mainstream media couldn't write an article about it every 6 months.