Email remains the soft underbelly of enterprise security because it is the most tempting target for hackers. They just need one victim to succumb to a phishing lure to enter your network. Phishing (in all its forms) is just one of many attacks that can leverage a poorly protected email infrastructure. Account takeovers (due to reused passwords), business email compromises, payment fraud, specialized mobile malware, and spam messages that contain hidden malware or poisoned web links. That places a heavy burden on any email security solution.