My reading of those emails is that they were sent to Pedosta Terri Mansfield as Mitchell was by this time old & weak & not fluent in use of the interwebz.
Mansfield is part of the "Phoenix Lights 3":
"A groundbreaking educational endeavor created by the Phoenix Lights 3: Dr. Lynne Kitei, researcher/author Dr. Rebecca Hardcastle and first-hand PL witness/CEO AZ Dept. of Peace Campaign, Terri Mansfield. www.phoenixlights3.com"
(http:// ufocongress.com/dr-lynne-kitei-presents-phoenix-in-a-new-light/)
Mansfield & Kitei & Hardcastle got very interested in the UFO sightings in Phoenix that occurred around a decade ago. Fife Symington eventually came out and said he saw them as governor. Not sure what was going on there, but it was something.
Anyway, not really sure to what extent Mitchell really wanted to work with Pedosta but Mansfield seems to have been the person driving those communications, and the wikileaks emails don't show that Pedosta ever replied to her.