Barracuda Sentinel is powered by an AI engine that detects and blocks spear phishing attacks in real time. The AI engine automatically learns the unique communication patterns of each individual organization. It uses this knowledge to find anomalous signals in the attributes of the incoming message's metadata and content. Barracuda Sentinel combines these signals to determine with a high degree of accuracy whether an email is part of a spear phishing attack. If identified, spear phishing attacks are quarantined in real-time, and the recipient and administrator are notified of the attempted attack.