How To Delete Sent Mail From Receiver’s Inbox In Gmail there are already 3.8 million email accounts, and the number is rapidly increasing. Is there, however, a mechanism to undo or cancel an email? Although some email systems provide this feature, there is no guarantee that the recipient will see it. Although some software claims to recall emails, this only works if the receiver uses the same software as you; otherwise, the recipient will receive the email you sent. The "Undo Send" tool in Gmail operates in an unusual way. You can alter your mind even after you've sent a message. However, you must act quickly because Gmail only allows you to pause your email for a short period of time.