An email Hunter Biden received in April 2015 from a Burisma executive discussing an introduction to then-Vice President Joe Biden, which lies at the heart of a New York Post investigation, is unquestionably authentic, a cybersecurity expert told the Daily Caller News Foundation on Thursday. The DCNF obtained a full copy of Hunter Biden’s alleged laptop from former New York Mayor Rudy Giuliani on Wednesday. The DCNF provided Robert Graham, the founder of the cybersecurity firm Errata Security, with a copy of the email and its metadata for forensic analysis. Graham, who has been cited as a cybersecurity expert in...