Gmail finally lets you 'Undo Send' emails

When it launched in 2009, Undo Send would delay sending your emails for five seconds, but it now lets users choose if they want to hold their mail for 5, 10, 20 or 30 seconds.

Google Labs is a collection of Gmail features that allows users to opt in to public betas for services that aren't quite yet ready for prime time. Undo Send was one of the most popular of the Labs features.

However, Undo Send is not currently available on mobile, so you're out of luck if you want to retract an email you sent via your phone. But there's good news: Google said it will roll out the feature to mobile in the future but didn't elaborate on the timeline.