How to Unsend an Email with Gmail

Lin Yutang gives an example: "if one answers letters promptly, the result is about as good or as bad as if he had never answered them at all."
This is one way to counter pointless efficiency, for Lin a vice that keeps Americans treading, nervous and unhappy; "besides the noble art of getting things done, there is," after all, "a nobler art of leaving things undone."
Now, about those letters you've just sent: you can still undo their sending and improve your results.
›› Wish you had not sent what you just sent? With the right settings, Gmail has not yet sent it, and you can still take it back. Yippee!