But in one email exchange between Clinton and staffer Jake Sullivan from June 17, 2011, the then-secretary advised her aide on sending a set of talking points by email when he had trouble sending them through secure means.
Part of the exchange is redacted, so the context of the emails is unknown, but at one point, Sullivan tells Clinton that aides "say they've had issues sending secure fax. They're working on it."
Clinton responds, "If they can't, turn into nonpaper w no identifying heading and send nonsecure."
There is no way to know whether the talking points themselves contained classified information. Typically, talking points are used for unclassified purposes (e.g. speaking with the media). But in some cases, the information contained in such memos may still be sensitive -- especially if the report originates from intelligence agencies.