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Mimecast Launches API Email Security with Full Threat Detection

Mimecast Launches API Email Security with Full Threat Detection
  • by: Source Logo
  • |
  • March 10, 2026

Mimecast has introduced a complete email security protection stack available through API deployment, eliminating the traditional trade-off between fast setup and comprehensive threat coverage. This first-of-its-kind API solution delivers gateway-grade protection—including deep URL inspection, malware sandboxing, behavioral AI, and advanced BEC detection—directly integrated with Microsoft 365, without requiring MX record changes or mail flow modifications.

Quick Intel

  • Mimecast’s API deployment now provides full email security capabilities, including Multi-Vector Threat Protection, deep URL inspection, advanced BEC protection across 20+ languages, malware sandboxing, and account takeover detection, matching or exceeding traditional gateway performance.
  • The solution deploys in minutes via Microsoft 365 integration, allowing organizations to test and validate protection without infrastructure changes while maintaining identical detection engines across API and MX-based architectures.
  • Mimecast’s AI models, trained on 24 trillion data points and deployed across 42,000 organizations, detect 3x more BEC and credential phishing attacks than conventional methods, addressing gaps in native Microsoft/Google controls.
  • 64% of organizations report insufficient native collaboration tool security, with 53% seeing increased phishing and 48% rising BEC attacks—issues Mimecast’s API stack is designed to stop at scale.
  • API deployment connects seamlessly with over 350 security vendors (endpoint, XDR, SIEM, SOAR, identity), feeding email threat signals into existing tools like CrowdStrike, Okta, and Palo Alto Networks for faster response.
  • Integrated with Mimecast’s Human Risk platform, email detections correlate with user behavior, insider risk, and generative AI activity, enabling unified visibility, behavioral nudges, data protection, and compliance insights.

Ending the Email Security Trade-Off

Standalone integrated cloud email security (ICES) solutions have offered quick deployment but often relied on native platform controls for everyday threats, leaving organizations exposed to volume-based attacks like phishing and BEC. Mimecast’s new API architecture changes this by bringing its full detection stack—previously available only through gateway deployment—directly into Microsoft 365 environments.

Ranjan Singh, Chief Technology and Product Officer at Mimecast, said: “Standalone ICES vendors secure email. Mimecast secures the human behind it. We've invested in AI and detection engineering that the market said couldn't be delivered through API architecture. The result is a fundamentally different approach to email security, one that gives organizations full protection without compromising deployment speed.”

Comprehensive Threat Protection Delivered via API

Mimecast’s API-based solution includes:

  • Multi-Vector Threat Protection (MVTP) — Correlates sender authentication, domain reputation, URLs, and content for layered analysis beyond single-vector engines.
  • Deep URL Inspection — Performs time-of-click analysis to catch threats that evade pre-delivery scanning.
  • Advanced BEC Protection — Uses modern AI across more than 20 languages to detect impersonation and social engineering with high precision.
  • Malware Detection and Active Sandboxing — Analyzes attachments in isolated environments to identify zero-day threats.
  • Account Takeover Protection — Identifies post-compromise behavior through identity signal correlation to contain breaches early.

These capabilities are powered by AI models trained on massive real-world data, enabling Mimecast customers to catch significantly more sophisticated threats than legacy or native solutions.

Flexible Deployment with Full Ecosystem Integration

Organizations can choose API deployment for rapid onboarding or retain MX-based architecture—both deliver the same advanced detection engines. The API option integrates directly with Microsoft 365, supporting quick proof-of-value testing without operational disruption.

Mimecast’s API connects to over 350 security tools across the ecosystem, automatically routing email threat signals into existing XDR, SIEM, SOAR, endpoint, and identity platforms. This eliminates silos and accelerates response times.

Unified Human Risk Management

Beyond email, Mimecast’s API deployment integrates with the broader Human Risk platform. Email detections feed into the Human Risk Command Center, correlating with user behavior, insider risk indicators, and generative AI activity. This unified view supports:

  • Security Behavior Management — Turning threat events into adaptive training and in-the-moment nudges to reduce repeat risk.
  • Insider Risk Management & Data Protection — Detecting negligent, compromised, or malicious insiders through email and file movement patterns.
  • Governance, Compliance & Insights — Providing search, discovery, and audit capabilities across collaboration data.

Mimecast API-based Email Security is available globally now. Organizations can start a risk-free proof-of-value or contact a Mimecast representative for details.

About Mimecast

Mimecast is a global cybersecurity and data governance leader redefining how organizations secure human risk. Its AI-powered, API-enabled connected human risk platform is purpose-built to protect organizations from the spectrum of cyber threats. Integrating cutting-edge technology with human-centric pathways, our platform provides enhanced visibility and strategic insight. By enabling decisive action and empowering businesses to protect their collaborative environments, our technology safeguards critical data and actively engages employees in reducing risk and enhancing productivity. More than 42,000 businesses worldwide trust Mimecast to help them keep ahead of the ever-evolving threat landscape.

  • Email SecurityCybersecurityThreat Detection
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