Ever wished you could unsend an email just after sending it, upon noticing a typo or a wrong recipient — or just realizing, a moment too late, that you shouldn't have written that email in the first place? Gmail is coming to your rescue with an "Undo Send" button, along with the option for how long after you hit "send" you can "unsend" each message. The option has existed for years in Gmail Labs, where users can test new features, and now it's coming to regular web Gmail for the first time. Click through to see how to set it up.
