A series of sexually explicit e-mails sent by the superintendent of the Des Moines, Iowa public schools triggered her abrupt resignation last month, and subsequently cost the 57-year-old educator her new post atop the Omaha, Nebraska school system. The correspondence exchanged by Nancy Sebring and a man with whom she was having an extramarital affair were sent via her school e-mail account, a violation of the system's Internet-use guidelines. Many of Sebring’s racy e-mails were sent during the workday (and were sent/received on devices owned by the Des Moines school district).