If you’ve ever sent an e-mail and then thought twice about it, Google’s Gmail is here to help you out.

Their new Undo Send feature, which has been secretly available in the Gmail Labs beta settings for several years, is now a feature for all Gmail users.

With the setting activated, Gmail will hold off on sending the email you just clicked “Send” on for a period of 5, 10, 20, or 30 seconds. The e-mail will remain in limbo during that time — it will not reach the recipient’s inbox until the countdown clock hits 0.

At any point during the limbo period the sender can click “Undo” at the top of Gmail, at which point it will bring the compose window back onto your screen so you can fix the e-mail before sending again… or you can just delete it entirely.

Using it is simple. First, turn it on by going to Settings and then scrolling down to the “Undo Send” section. You can then select how long of a limbo period you want. Finally, click “Save Changes” at the bottom. Your Undo button is good to go!

An Undo button gives users an added level of comfort while writing e-mails. This writer has had the feature turned on for a couple of years through Gmail Labs and has used it a countless number of times. It’s easily one of the best features Gmail has been testing, so it’s no surprise that it’s one of the first beta features to graduate out of beta (see the other features Gmail is testing here).

Now how do we get this undo button available for other aspects of our lives?