Executives tempted to chuckle at bank chief Jes Staley's recentemail missteps might want to hold off on the smugness.

When you look at trends among senior leadership at largecompanies, it's easier to believe a CEO can be tricked intobelieving a fake email from a colleague is genuine, as the Barclaysboss reportedly did. Even after Hillary Clinton's private serverscandal and two decades of experience by big companies on how tomanage employee email use, high-level executives are routinelyusing tools for communication that their company would rather theydidn't.

That means that even if Staley spotted the Gmail address atopthe “phishing” messages from the impostor posing as BarclaysChairman John McFarlane, he might not have thought anything ofit.