This particular e-mail had nothing to do with Clinton.  It was an e-mail that was sent to her unclassified.  It was retroactively classified by the FBI AFTER Clinton had already left office.  A career diplomat at the State Department pushed back against the retroactive classification by another agency, and the FBI proposed giving the classification another look if the State Department would open up more embassy slots for their agents overseas - nothing came of it.  Absolutely nothing to do with Clinton at all.