She was using the server for State Department business. That much is very clear based on what has been released. The secret stuff is the back room deal making ole Sid was engaging in to enrich Hillary and company based on insider info that she was able to generate based on CIA, DIA, and NSA reports among others. In other words she was using government agencies to enrich herself.
IF she was using her private server to email someone at State, then the recipients' email inboxes are readily available. This whole thing is an extension of the Benghazi witch hunt.
And well it should be. The Benghazi "witch hunt" as you call it was hampered by the fact that her emails were not forthcoming. She was hiding the dirty deals that Blumenthal was doing and because she was worried about those coming to light I feel she pulled the rug out from under the guys in Benghazi.
The stand down order is a farce. There was a QRF an hour and a half away. Why weren't they sent?
Witch hunt? Far from it. A US ambassador was left hanging and we the People demand to know why.