Yahoo didn't install an NSA email scanner, it was a "buggy" NSA "rootkit"

Ex-Yahoo employees have spoken anonymously to Motherboard about the news that Yahoo had built an "email scanner" for a US security agency, likely the FBI or the NSA. These sources -- at least one of whom worked on the security team -- say that in actuality, the NSA or FBI had secretly installed a "rootkit" on Yahoo's mail servers and that this was discovered by the Yahoo security team (who had not been apprised of it), who, believing the company had been hacked, sounded the alarm, only to have the company executives tell them that the US government had installed the tool. (more")