From Dominance to Decline: The Fall of the SEG and the Future of Email Security

Secure email gateways once defined enterprise protection, but the rise of cloud platforms and AI‑powered threats has exposed their limits. This white paper explains why SEGs fail to stop the last 1% of advanced attacks, including business email compromise and social engineering, and how Abnormal’s behavioral AI closes that gap. With seamless API integration into Microsoft 365 and Google Workspace, Abnormal detects missed threats, automates remediation, and reduces SOC workload. The SEG Migration Program shows how hundreds of organizations have modernized their defenses while cutting costs.