Have you ever clicked "Send" on an email and regretted it a fraction of a second later? Whether you were angry and typed something you shouldn't have, clicked "Reply All" when you wanted "Reply," or ...

If you don’t have 30 seconds to watch the above video, here’s how to do it: 1. Launch Gmail. 2. Click the gear icon in the upper-right corner, then Settings. 3. Click the Labs tab. 4. Find Undo Send ...