Shortly after March 15, 2013: Cheryl Mills expresses concerns to Bryan Pagliano about the security of Clinton’s private email server after the Guccifer hack.

On March 14, 2013, the Romanian hacker nicknamed Guccifer broke into the email account of Clinton confidant Sid Blumenthal and made Clinton’s private email address public. Cheryl Mills was Clinton’s chief of staff until January 2013, when both she and Clinton left the State Department. But Mills continues to assist Clinton, and in August 2016 she will mention in written answers to a Freedom of Information Act (FOIA) lawsuit that she was concerned at this time how the Guccifer hack could impact the running of Clinton’s private email server.

She says she discussed the issue with Bryan Pagliano, Clinton’s computer technician “in or around March 2013, when the email account of Sidney Blumenthal was compromised by a hacker known as Guccifer. As I recall, these discussions involved whether this event might affect Secretary Clinton’s email.”

Clinton changed her email address several days after the Guccifer hack was discovered. However, the server continued to operate and her new email address was also hosted on the same server. It is still unknown whether Pagliano or anyone else took any other security steps in response to the hack. (Politico, 8/10/2016)

March 20, 2013: Gawker publishes an article that reveals Clinton’s use of a private email address and notes it “could be a major security breach.”

The article notes that the hacker nicknamed Guccifer broke into the email account of Clinton confidant Sid Blumenthal. “[W]hy was Clinton apparently receiving emails at a non-governmental email account? The address Blumenthal was writing to was hosted at the domain ‘clintonemail.com’, which is privately registered via Network Solutions. It is most certainly not a governmental account. […] And there seems to be little reason to use a different account other than an attempt to shield her communications with Blumenthal from the prying eyes of FOIA [Freedom of Information Act] requesters.

Neither the State Department nor the White House would immediately comment on whether the White House knew that Blumenthal was digitally whispering in Clinton’s ear, or if the emails were preserved as the law requires. And if, as it appears, Blumenthal’s emails contained information that was classified, or ought to have been treated as such, it could be a major security breach for Clinton to have allowed it to be sent to her on an open account, rather than through networks the government has specifically established for the transmission of classified material.” (Gawker, 3/20/2013)