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Not necessarily. Part of Hillary's plan was to be able to say,
I never received nor sent anything MARKED classified."
A part of her strategy was to have someone in her DoS -- between the incoming classified server and her "hackbait" server on the internet -- DELETE all the classification markings.
No one can prove that she (or her lawyers who erased messages) recognized the classification level of such unmarked messages.
Her downfall is that those DoS minions were sloppy -- and missed deleting a few of those "(C)" portion markings -- proving that they originally were marked classified (Confidential)...