What is Mimecast?

**Mimecast** is a cloud email security platform providing: threat protection (**malware**, **phishing**, **impersonation**), continuity (access during outages), archiving (retention and discovery), and awareness training.

Key features: URL scanning and rewriting, attachment sandboxing, **impersonation** detection, internal email protection, and **DMARC** management. Integrates with major email platforms.

Market position: enterprise-focused, comprehensive security suite. Competes with **Proofpoint** and **Microsoft Defender** for **Office 365**. Evaluation should consider: integration requirements, feature needs, and total cost of ownership.