Gmail has just rolled out, perhaps, the most useful update. Yes, we’re talking about the ‘Undo Send’ feature. Google had been working on this feature for the past six years, and the work is now an official setting in the Gmail interface. As the name suggests, Undo Send pauses posting your email for a few seconds after you click Send, so you can take it back if you, for example, spell someone’s name wrong. When it started in 2009, Undo Send would pause sending your emails for five seconds, but now, it lets users choose if they want to retain their mail for 5, 10, 20 or 30 seconds.