Gmail is getting a big revamp today in what Google calls “the biggest overhaul of the app in nearly four years.” While it’s largely an aesthetic change, there are a few interesting new features to note. First up, that new look: it’s a lot more like the Android app, with ample use of red for a more Material Design Feature-wise, the main addition is Undo Send, which means you now have a life-saver for those times you email the wrong person and notice immediately after. For a few seconds after shipping a message, you’ll be able to click on ‘Undo’ at the bottom…

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