Question: Hillary Clinton who served as the 67th United States Secretary of State, under President Barack Obama, used what type of email server for official communications, rather than official State Department email accounts maintained on federal secure servers?
Sentence (from "Hillary Clinton email controversy"): Those official communications included over 100 emails which contained classified information at the time they were sent, as well as nearly 2,100 emails which were not marked classified but would retroactively be ranked as classified by the State Department.
Relevant evidence: No