July 3, 2009: The NSA begins monitoring government email traffic for hacking attacks, but Clinton’s private server doesn’t benefit.

It is announced that the National Security Agency (NSA) will monitor the email traffic of 12 US government departments, including the State Department, in order to combat hacking. In a monitoring program called Einstein 3, telecommunication companies route data going to and from government networks through the NSA, which examine the traffic for any activity suggestive of an attack. (Wired Magazine, 7/8/2009) 

In 2015, Wired Magazine will note that because Clinton used a private email server, her “email [didn’t] have the benefit of any of that expensive government security.” (Wired, 3/4/2015)