That's what I'm wondering. Either her, or someone close to her leaked them. Another possibility is an admin of the email system he was using got them and gave them to the paper. A 'hacker' compromising his/her system, or email server is also plausible.
Mark Levin mentioned on his show something about a FOIA request filed but it doesn’t make sense that he would not know it long before now because these emails are from 2008!!
Something smells.