The email was sent on Nov. 21 from a Gmail account registered in the name “Frank David” It was the latest release of potentially embarrassing corporate information following a major hack on the company’s computer networks two weeks ago. The email message was among thousands released on Monday when the email boxes of two top Sony executives were leaked online. Sony Pictures first learned of the hack on November 24, when computer screens at the company showed a message telling users the network had been hacked. The U.S. Federal Bureau of Investigations is understood to be spearheading the probe.”]