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"): In March 2015, it became publicly known that Hillary Clinton, during her tenure as United States Secretary of State, had used her family's private email server for official communications, rather than official State Department email accounts maintained on federal secure servers.
Relevant evidence: Yes