UPDATE 1-Ex-Jefferies trader's emails reviewed in U.S. fraud trial

NEW HAVEN, Conn., Feb 25 (Reuters) - Jesse Litvak, a former trader at Jefferies Group Inc, made extra commissions and profits by defrauding big Wall Street firms such as JPMorgan Chase & Co and AllianceBernstein Holding LP on bond trades, a U.S. Treasury Department agent testified at Litvak's fraud trial.