The use of a seperate email account and server for state business is egregious in its own right, notwithstanding that it was used to transmit confidential information in violation of federal law.
Then, she proceeded to have roughly 2/3 of the emails on that server destroyed prior to turning it over to authorities, claiming they were personal in nature. Not only is that criminal, but we also know it is a lie.
How anyone could bring themself to vote for this person is mind boggling. Her actions and judgment in this single ordeal while SOS (disregarding the train wreck that was her tenure as SOS) render her patently unfit for the office of president.