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"Another day, another new feature in Gmail Labs.  This one could be more useful than most, as it\u2019s something you probably have a reason to use with some frequency.  It\u2019s called \u201CUndo Send,\u201D and as the name suggests, it lets you take back a sent email, as long as you act quickly enough.  \nAfter enabling the feature, Undo Send works much like Gmail\u2019s other \u201Cundo\u201D features.  When you send an email, you get a message confirming it has been sent, along with a link to \u201CUndo.\"  This message lasts for 5 seconds, at which point you lose the opportunity to take it back. \nWhile that might not be much time, it\u2019s probably enough to pull back emails where you forget an attachment, forget to cc someone, or catch an obvious typo.  As for emails you later wish you hadn\u2019t sent because of the content, Gmail still can\u2019t help you there.\nMore Gmail Resources From Mashable\n\n- GMAIL TOOLBOX: 60+ Tools for Gmail\n- 13 Gmail Extensions for Firefox 3\n- 7 Ways to Send HUGE Files: 25X Bigger than Gmail\n"^^<http://www.w3.org/2001/XMLSchema#string>
<http://mashable.com/2009/03/19/gmail-undo-send/>