An ordinary employee would most likely get fired if they used their own server for state mails. This is what we mean by putting security and ultimately the nation at risk. If a company has not had any accidents but it does not follow legal guidelines on safety it can be fined or even shut down until it complies.
Most likely?
I'm a veteran and have also worked as a civilian for the Air Force. I've gone through the security clearance process. "Most likely fired" doesn't cut it. If any normal person had done that, "definitely jail, fine, and permanent revocation of clearance" would be the result.
But that's just from someone who actually knows about security clearances and safeguarding of classified information. It's not actually relevant to any discussions on Talk Freethought,