Why Security Leaders Are Layering Email Defense on Top of Secure Email Gateways
Apr 13, 2026
For security leaders, the inbox remains the front door for attackers. Here's why the smartest teams are adding adaptive, AI-driven protection to their cloud email security, not replacing them. Email is still the number-one attack vector for enterprises, and it is not even close. The FBI's Internet Crime Complaint Center reported that business email compromise alone generated $3 billion in losses in 2024 , with AI-enabled attacks accelerating the trend ( FBI IC3 Report ). The attacks that succeed today don't carry obvious malicious payloads. They rely on trust, tone, and timing; a spoofed vendor sending a "routine" invoice update, or a convincing impersonation of a CEO with an urgent request. No malware. No suspicious links. Just words, carefully chosen. Microsoft 365 is the backbone of productivity for most organizations, and Microsoft Defender and Exchange Online Protection do solid work catching known spam, malware, and co...
