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Why AI-Powered Email Security Outperforms Traditional Gateways

Traditional email gateways match known signatures. AI-powered email security understands intent and context. Here's why the shift matters for regulated firms.

Mimecast

April 16, 2026 · 7 min read

Signatures can't keep up

Legacy gateways block what they've seen before. Today's phishing — BEC, quishing, AI-written lures — is novel by design, so signature matching misses it.

What AI adds

Behavioral models read intent and context: tone, relationship history, and anomalies that indicate impersonation, even with no known-bad indicator. That's how modern attacks get caught.

Why it matters for regulated firms

For legal, healthcare, and financial organizations, a single BEC or data-exfiltration email can trigger breach notification. Catching intent — not just signatures — is the difference. We deploy and tune AI email security as part of our security stack.

Mimecast

AI-powered email security

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