How many times have you hit “Send” on an email, only to realize you goofed. More often than you want to admit, right? Outllok has a recall feature that works on Exchange … some of the time. But basically emails sent via the Internet, once you hit “Send,” they’re gone. Until Gmail’s “Undo Send” feature, that is. It’s another Gmail Labs feature, so to enable it you have to go into Settings, Labs, scroll down to Undo Send and enable it. It’s the same thing as sending any other email via the Internet, though.