Traditional Secure Email Gateways (SEGs) are no longer sufficient against modern email threats. Built for an era of **** and signature-based detection, SEGs operate at the network perimeter and lack visibility into internal communications. As a result, they cannot detect lateral **** or Business Email Compromise (BEC) attacks originating from compromised internal accounts. They also require MX record changes, adding complexity, latency, and administrative burden.

API-based email security offers a more advanced approach by integrating directly with platforms like Microsoft 365 or Google Workspace. It scans both external and internal emails, detects unusual behavior patterns, and enables rapid organization-wide remediation by removing malicious messages post-delivery. Enhanced by AI, these systems analyze context and user behavior to identify sophisticated, zero-day, and socially engineered attacks. As threats grow more advanced, organizations are increasingly adopting API-based solutions for smarter, more adaptive protection.