From the redacted emails that have been released, there have been numerous signs of separate crimes being committed surrounding both gross negligence and willful acts, including where she told her subordinates to remove origination headers, which implies classification (a crime to remove and separately to order others to do it), to send via fax (a separate crime). The same people that have been willfully blocking the investigation (yet another crime) assured the public that this was not classified content.
This is misinformation. Comey stated in the committee yesterday that it was well known in diplomatic circles that the particular phrasing she used meant making the material safe for a third-party and was not an instruction to remove classification headings. And I quote:
Comey said, “Actually it caught my attention when I first saw it, and what she explained and other witnesses did as well is what she meant by that is send it in a non-classified format," Comey said. “In diplomatic circles ('non paper') means something we could pass to another government.”