This document is a Buyer's Guide focused on email security, addressing the critical need for enhanced protection against email-based cybersecurity threats, which are prevalent in 2024. It outlines the limitations of default email solutions provided by major companies like Microsoft and Google, emphasizing that these solutions do not offer sufficient protection against sophisticated attacks such as phishing and malware. The guide presents a framework for evaluating various email security vendors, detailing essential features such as the necessity of AI and machine learning for threat detection, flexible deployment options, and comprehensive malware protection. It discusses the current state of the email security market, highlighting the shift from on-premises solutions to cloud-based security and the emergence of integrated cloud email security solutions. The guide also includes insights from industry analysts regarding the effectiveness of different email security solutions and the importance of understanding AI claims in marketing. Overall, it aims to empower organizations to make informed decisions when selecting email security solutions.