Cheryl Mills, Clinton’s chief of staff, forwards to Clinton an email with the subject heading: “URGENT — From Dave Petraeus’s Chief of Staff…” The name of the sender of the original email will later be redacted because it mentions the name of a secret CIA official. However, the subject heading logically suggests the sender is the chief of staff of CIA Director David Petraeus. The original email is sent at 4:44 a.m., suggesting it is quite urgent.
Parts of the email chain are later redacted due to containing “foreign government information” as additional mentions of secret CIA officials, although it’s unclear if all of these are the same person. Emails in the chain are too heavily redacted to be understood, although it might relate to security protocols, because Mills makes the comment, “I do want to discuss this situation as it will reoccur and we have protocols that we follow that I welcome covering with you.”
The email will later be classified at the “secret” level, which is the medium classification level, although it is not clear how much of this is due to the mention of a secret CIA name or names and how much is due to the urgent content in the emails. (US Department of State, 1/29/2016)
Clinton replies to Mills at 6:49 a.m., presumably just after arriving to work, agreeing to receive a phone call from Mills about the matter a short time later. Clinton’s reply email will also be later deemed “secret,” because it includes all of the previous emails in the chain. (US Department of State, 1/29/2016)