Mimecast Review 2026
Last updated: May 2026
Free Trial Available
Cloud email security platform providing advanced threat protection, archiving, continuity, and awareness training against email-borne attacks.
| Category | Email & Phishing Security |
|---|---|
| Pricing | Paid |
| Rating | ★★★★ 4.3 / 5 |
| Free Trial | Yes |
Key Features
- AI-driven email security blocking phishing, BEC, and malware variants
- CyberGraph AI mapping relationships to detect social engineering
- DMARC Analyzer enforcing email authentication at scale
- URL Protect scanning all links in real time on every click
- Attachment Protect sandboxing suspicious file types before delivery
- Brand Protection monitoring for domain spoofing and lookalikes
- Security awareness training with human risk scoring per employee
- Native Microsoft 365 and Google Workspace integration
Detailed Review
Mimecast is a cloud-native email security platform protecting more than 40,000 organizations globally from email-borne threats including phishing, ransomware, BEC, and impersonation attacks. Unlike gateway-based solutions that inspect mail at the perimeter, Mimecast operates as a cloud relay — all email flows through Mimecast's infrastructure before delivery, providing consistent protection regardless of whether users are in the office or remote.
Mimecast's CyberGraph is its most innovative technology: an AI-powered relationship intelligence layer that builds a dynamic graph of normal communication patterns for each user. When an email arrives that impersonates a known contact or appears to come from an unusual sender, CyberGraph flags the anomaly with a visual warning injected into the email — helping users make informed decisions without blocking legitimate mail. This is particularly effective against highly targeted CEO fraud and supply chain impersonation attacks.
The platform's URL Protect capability rewrites every URL in incoming email, scanning them at click time to catch URLs that were clean at delivery but redirected to malicious content hours later — a common technique used to evade sandboxes. Mimecast's DMARC Analyzer helps organizations implement and monitor email authentication policies across their entire domain estate, reducing impersonation risk. Its integrated security awareness training platform tracks each user's "human risk score" and automatically assigns remediation training based on click behavior and simulation results.
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