Hillary Clinton says none of her emails had classification headers

During an NBC forum that focused on the presidential candidates’ national security chops, host Matt Lauer asked Democratic nominee Hillary Clinton why it isn’t disqualifying that she dealt with highly sensitive material on a private, unclassified email system.

Clinton said she made a mistake using the system, but she still took classification seriously. "I have a lot of experience dealing with classified material, starting when I was on the Senate Armed Services Committee going into the four years as secretary of state," she said. "Classified material has a header which says ‘top secret, secret, confidential.’ Nothing, and I will repeat this, and this is verified in the report by the Department of Justice, none of the emails sent or received by me had such a header." 

Given that we’ve found Clinton’s email did contain some classified information, this statement intrigued us....
http://www.politifact.com/truth-o-meter/statements/2016/sep/07/hillary-clinton/clinton-says-none-her-emails-were-labeled-top-secr/