Our troop movements, and whatever other highly classified information they couldn't be bothered to send their indentured servants to the SCIF for, were sent over the same level of security that JOHN "WHATS MY NAME" PODESTA USED ON HIS OWN GMAIL!!!
Whoever had access to Podesta's email password had access to our most sensitive compartmentalized information.
https://townhall.com/tipsheet/cortneyobrien/2017/01/04/assange-podestas-password-was-password-n2267069
The password was password. Anyone who wanted in could get in. It's not like he used a secret email address.