Take your E-mail back

When you send an email to the person and you have muster up it many time and hit n send, later you found that you have typed the spelling of your client wrongly and you will search for undo mail but you cannot find that. Now Google introduced an Undo Send feature that is added to all accounts.

https://www.washingtonpost.com/news/the-switch/wp/2015/06/23/ever-send-an-e-mail-you-wish-you-could-take-back-now-in-gmail-you-can/