Mimecast
Human Risk Management platform — email security, collaboration, insider risk, and AI governance
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About Mimecast
Mimecast was evaluated by our editorial lab for workflow efficiency and practical value. Mimecast is a global cybersecurity company founded in 2003 in London by Peter Bauer and Neil Murray, taken private by Permira for approximately $5.8 billion in January 2022. Serving 42,000+ organizations worldwide with ~2,415 employees, Mimecast reported its strongest expansion y...
Mimecast is a global cybersecurity company founded in 2003 in London by Peter Bauer and Neil Murray, taken private by Permira for approximately $5.8 billion in January 2022. Serving 42,000+ organizations worldwide with ~2,415 employees, Mimecast reported its strongest expansion year on record in 2025 following its strategic repositioning around Human Risk Management (HRM) \u2014 extending its platform from email security to cover the full spectrum of human-related cyber risk.
Mimecast\u2019s HRM platform combines Advanced Email Security (AI, NLP, machine learning, and social graphing), Targeted Threat Protection (TTP) for URL rewriting and attachment sandboxing, Email Continuity ensuring email keeps functioning during Microsoft 365 outages (a unique market capability), Collaboration Threat Protection for Teams and Slack, Incydr insider risk management (from Code42), Aware data governance and compliance archiving, and Mimecast Engage security awareness training. In March 2026, Mimecast launched its next-generation HRM platform with agentic AI security and AI governance for AI-augmented threats.
Mimecast is the right choice for mid-market and enterprise organizations wanting email security, email continuity, collaboration security, insider risk, and awareness training from a single vendor \u2014 particularly those prioritizing business resilience and the broadest human risk coverage.
Key Features
- Advanced Email Security — AI, NLP, machine learning, and social graphing for phishing, BEC, malware, and impersonation detection
- Targeted Threat Protection (TTP) — URL rewriting at click-time and attachment sandboxing for spear phishing and zero-day attacks
- Email Continuity — ensures email keeps flowing during Microsoft 365 outages, server downtime, or ransomware events
- Collaboration Threat Protection — extends AI security coverage to Microsoft Teams, Slack, and other collaboration platforms
- Incydr Insider Risk Management — detects data exfiltration and insider threats via Code42 acquisition
- Aware Data Governance — compliance archiving, e-discovery, and behavioral analytics across communications
- Mimecast Engage Security Awareness Training — phishing simulations, training modules, and human risk scoring per employee
- DMARC Analyzer — domain authentication enforcement protecting against domain spoofing and impersonation
- Agentic AI Security — governs AI agent activity and protects against AI-augmented attacks (March 2026 platform)
- Email Archiving — cloud-based archiving with fast search for compliance, e-discovery, and business continuity
Pros
- 42,000+ customers — strongest mid-market penetration of any email security vendor globally
- Email Continuity is unique — business email keeps working during outages, a capability Proofpoint and Abnormal don’t offer
- Human Risk Management platform covers email + collaboration + insider risk + awareness in one subscription
- Collaboration Threat Protection extends to Microsoft Teams and Slack — critical as attacks shift to chat
- March 2026 agentic AI security platform — addresses AI-augmented threats and enterprise AI governance
- Strongest expansion year on record in 2025 — positive growth momentum under Permira ownership
- NLP + social graphing BEC detection analyzes communication patterns, urgency signals, and relationship history
Cons
- Taken private by Permira ($5.8B, 2022) — reduced public transparency vs publicly traded competitors
- BEC detection accuracy less precise than Abnormal AI’s pure behavioral approach per practitioner reviews
- Modular platform means costs escalate quickly when adding TTP, archiving, and insider risk modules
- No published pricing — requires sales engagement for enterprise and bundled plans
- Multiple acquired products (Incydr, Aware, Engage) can feel fragmented vs a natively unified platform
Pricing
Mimecast offers tiered pricing:
Protect plan: ~$5-8/user/month \u2014 AI email security, social graphing, phishing and BEC protection.
Protect Plus: ~$8-15/user/month \u2014 adds Targeted Threat Protection URL and attachment sandboxing, email continuity, and data protection.
Enterprise pricing for large organizations needing archiving, DMARC Analyzer, Incydr insider risk, and Aware compliance requires custom quotes. Contact Mimecast through mimecast.com for enterprise pricing and a free threat scan trial.
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Connect with Mimecast
Frequently Asked Questions
Mimecast’s HRM platform combines advanced email security, collaboration threat protection for Teams and Slack, insider risk management (Incydr), data governance and compliance (Aware), and security awareness training (Mimecast Engage) into a unified platform with a single human risk score per employee across all threat vectors.
TTP is Mimecast’s advanced threat defense module. URL Protection rewrites every link in inbound email and scans it at click-time. Attachment Protection sandboxes suspicious files before delivery. Impersonation Protection detects display name spoofing and lookalike domains for BEC attacks.
Email Continuity ensures organizational email keeps functioning during mail server outages, Microsoft 365 downtime, or ransomware attacks. Mimecast maintains a cloud-hosted emergency inbox so employees can continue sending and receiving email even when their primary mail system is unavailable — a unique capability that Proofpoint and Abnormal AI do not provide.
Protect plan: ~$5-8/user/month (AI email security, social graphing, phishing protection). Protect Plus: ~$8-15/user/month (adds TTP, email continuity, data protection). Enterprise pricing for archiving, Incydr, and Aware modules requires custom quotes from Mimecast sales.
Mimecast was acquired by Permira for approximately $5.8 billion in January 2022, delisting from NASDAQ. It serves 42,000+ customers globally from its London headquarters and reported its strongest expansion year on record in 2025.
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