According to the State Department, Colin Powell as well as high level aides to Condeleeza Rice handle classified info on their personal email addresses. Clinton is the only one who set up her own private server though.
Source?
The law restricting government officials to use government email was only passed in 2009. Powell or rice weren't abusing any written rules, Clinton was.
I'd also like to know the answer to this, it seems rather unlikely to me that secretaries of state are running their own email servers, or using something like gmail for confidential emails.
The server was maintained by the Clinton's tech guy. The deceive was housed in a utility closet off the bathroom in one of their mega houses. This isn't a gmail yahoo type deal. This is a high school kids email setup. Not professional in the least.