“This is a legitimate email,” Charles Delavan, a Clinton campaign aide, replied to another of Mr. Podesta’s aides, who had noticed the alert. “John needs to change his password immediately.”
With another click, a decade of emails that Mr. Podesta maintained in his Gmail account — a total of about 60,000 — were unlocked for the Russian hackers. Mr. Delavan, in an interview, said that his bad advice was a result of a typo: He knew this was a phishing attack, as the campaign was getting dozens of them. He said he had meant to type that it was an “illegitimate” email, an error that he said has plagued him ever since.