Email services are a critical part of an organization's daily operations, making them a frequent target for attackers through phishing and email spoofing. While various security mechanisms exist to mitigate these risks, their complexity often leads to misconfigurations. Furthermore, since email services can function without them, these mechanisms are overlooked, leaving systems exposed to threats.

This talk will provide a comprehensive exploration of email security mechanisms, examining their intended use, common configuration mistakes, the gap between practical implementation and RFC standards, and the future of these mechanisms. We will focus on preventing spoofing attacks and enhancing the security of email transmission. Finally, by analyzing real-world cases, we will offer practical recommendations to help effectively address these challenges.