Rather, the intelligence community believes a State Department employee received the information through classified channels and then summarized it when that employee got to a nonclassified State Department computer. The email chain went through Mrs. Clintons most senior aides and eventually to Mrs. Clintons personal email, the sources said.
It was not marked as classified, but whoever viewed the original source reports would have readily seen the markings and it should have been recognized clearly by a trained employee who received the information subsequently as sensitive, nonpublic information. Intelligence community professionals are trained to carry forward these markings and, if needed, request that the information be sanitized before being transmitted via non-secure means.
The discovery could affect the FBI investigation of Mrs. Clintons email, putting the originator of the email chain into legal jeopardy and allowing agents to pressure the employee to cooperate as they try to determine how classified information flowed so freely into Mrs. Clintons account and what senior officials knew about the lax system that allowed such transmissions.
"Believes". It should be pretty obvious if this was being done. the DJust compare the original with what ended up on Hillary's server.
It should also be easy to figure out who that State Dept. employee is once the email chain is traced back to the source. Now we know why there is so much interest in Abedin and Mills and why those two have obtained legal counsel.