This actually started as turning a bug into a feature. The gmail servers delayed sending the email for about 5 seconds normally, all they did was add a cancel b

This actually started as turning a bug into a feature. The gmail servers delayed sending the email for about 5 seconds normally, all they did was add a cancel button. Source: http://www.searchenginejournal.com/gmail-labs-rolls-out-undo-send/9376/ http://www.searchenginejournal.com/gmail-labs-rolls-out-undo...