Entering a clients email address last week, a contractor accidentally swapped @gs.com for @gmail.com — so instead of sending to a Goldman Sachs employee, the message went to a random stranger. Normally, that would just be an embarrassment, but this particular email included private client data, and Goldman Sachs is willing to move heaven and earth to get it back. According to a new report from Reuters, the battle has taken the Wall Street firm to the New York State Supreme Court, pleading with Google to delete the email to prevent a needless and massive privacy violation, in the companys words. Its an unprecedented demand — effectively asserting the right to unsend an email if it can be established that the email was sent in error — but Google says its willing to comply if Goldman can get a court order to that effect.