I just saw in the Gmail blog that they added an Undo Send feature.  Seems like a pretty cool feature, but not as useful as the Outlook (Exchange) feature.  This Gmail Undo Send only gives you 5 seconds.  It does not, however, let you suck back an email a day later after you’ve had time to sleep on it.  I’m sure some people will find this pretty useful (I’m definitely keeping this enabled on mine), but I think having a larger undo window would be more useful.

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