What is Email Security Gateway?

An Email Security Gateway (ESG) is a solution that sits between the email sender and the recipient's mail server, inspecting inbound and outbound email traffic for malicious content, spam, phishing attempts, and data leaks. It filters and blocks suspicious emails, protecting organizations from email-borne threats and ensuring compliance with data security policies. ESGs are commonly used to prevent malware infections, protect sensitive information, and maintain email service availability.