Beware that email from your 'boss. ': An email from the boss typically gets your attention. Unfortunately, fraudsters know this too and are increasingly using email impersonations to launch their scams. These attacks known as “spear-phishing”—where an email appears to be from a familiar and trusted sender—have become pervasive, and have led companies and governments to invest in tools to stop them. One of the leading tools is designed by Agari, a Silicon Valley-based startup that relies on AI and cloud-based analysis to detect and intercept spear-phishing attacks.