This Gmail tip is a lifesaver. First off, go to your Gmail inbox. In the top right-hand corner, click on the settings gear, and then click on see all settings. In the general tab, scroll down to this option that says undo send, and over here, let’s set that to 30 seconds. At the very bottom of the page, click on save changes. Here I’ve composed a very thoughtful message to my manager. Down at the bottom, I’ll click on send and I now have up to 30 seconds to undo that. Yeah, I should probably undo it. I need that job.