Apparently the Secretary of State does not even have access to a classified email system:

Secretary Clinton did not have a classified email system. She had multiple other ways of communicating in a classified manner, including assistants or staff members printing classified documents for her, secure phone calls, or secure video conferences.[1]

I'm surprised. Seems like it would pretty useful in that role.

[1] http://www.nytimes.com/interactive/2015/03/10/us/politics/11...