I hope my last link on IRS emails for a while. Megan McArdle does a fine job explaining the possibilities and the problems. She ends this way:
In 2014, every government agency should be storing every e-mail that goes in or out in an easily accessible format. That they weren’t bothering suggests that the IRS does not expect to deliver the kind of accountability that it routinely demands of taxpayers. That’s potentially a much bigger problem than anything Lois Lerner stands accused of -- and it should be rectified, government-wide, with all due speed.