As far as I am aware neither the default Android mail handler nor the Gmail handler store the message headers so I'm afraid you are out of luck.
Another issue is that X-Originating-IP was only a reliable source for some mail and not for others. I for one would never stand in court and state that this IP address was the definitive source of the email.
If you read Athulin's comment in this thread http://www.forensicfocus.com/Forums/viewtopic/t=11968/ then you should know that 'X-' headers have been deprecated anyway.
Sorry to be the bearer of bad news...
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