Mimecast Advanced Email Security

Mimecast Advanced Email Security is a cloud-based cybersecurity and email security solution designed to protect Microsoft 365, Google Workspace, and on-premise email environments from phishing, business email compromise (BEC), ransomware, malware, impersonation, and zero-day attacks. Its AI-powered detection combines machine learning, social graphing, attachment sandboxing, URL and on-click protection, computer vision, anomaly detection, email banners, and automated remediation, while offering both MX gateway-based and API-based deployment. Users generally rate its protection highly, with G2 showing a 4.4/5 rating from 320 reviews and Gartner Peer Insights reporting 4.5/5 from hundreds of reviewers; users particularly praise its effective phishing and spam filtering, configurable security policies, reliable protection, and integrations with Microsoft 365, Outlook, Teams, and other security tools. The interface is considered manageable for everyday monitoring and policy administration, although several administrators report that advanced settings can be deeply nested and the platform has a learning curve. Some users also mention false positives, delayed legitimate emails in quarantine, occasional slow administration screens, and URL rewriting issues.