Do foreign threats care if something has classification markings or not if they're learning about classified things they're not supposed to see? Hell no they don't!!!
If Hillary assumed classified information in her emails was okay because it was not marked and therefore the enemy wouldn't care about it, she belongs in federal prison.
If I sent the launh codes for nukes over Hillaries server, I could get a pass. As long as they were not marked classified and Humma Weiner sends them for me.