This document is a checklist designed for Chief Information Security Officers (CISOs) to evaluate and enhance their organization's email security posture. It outlines key areas of focus, beginning with the necessity of implementing robust email security tools that can effectively counter cyber threats, given that email remains the primary attack vector. The checklist emphasizes the importance of zero-click threat prevention through ongoing monitoring and advanced algorithms to neutralize threats before they reach users. It also details the need for comprehensive threat detection mechanisms, including machine learning, sandboxing, and real-time threat intelligence. Furthermore, it addresses data protection strategies, employee awareness programs, routine audits, and the establishment of an incident response plan. The document concludes by highlighting the significance of integrating email security tools with existing cybersecurity technologies to strengthen overall security posture.