Mimecast / mimecast.com
AI-powered email security and continuity platform providing AI threat detection, email continuity during outages, archiving, and security awareness for enterprise email protection.
Pricing
Free
Free plan
No
Category
Developer Tools
Platforms
4
Free plan
No
API access
No
Open source
No
Platforms
4
Mimecast is an enterprise email security and continuity platform — providing AI-powered threat detection, email continuity during Microsoft 365 or Google Workspace outages, archiving for compliance, and security awareness training for enterprise organisations. Email Security provides AI-enhanced filtering of phishing, malware, and spam — analysing email content, sender reputation, and attachment behaviour to identify threats. Email Continuity is Mimecast's distinctive capability — providing a separate email infrastructure that employees use during Microsoft 365 or Google Workspace outages, ensuring email operations continue uninterrupted when the primary email platform fails. Archiving provides compliance-grade email retention — immutable email archives for legal hold, eDiscovery, and regulatory compliance without separate archiving infrastructure. Security Awareness Training (Awareness Hub) provides phishing simulation and training content — security education alongside technical email security in one platform. URL and Attachment Protection sandboxes suspicious links and attachments — detonating content in isolated environments before delivery to employees. Brand Exploit Protection detects look-alike domains and spoofed websites that attackers use to deceive employees — monitoring for domains mimicking the organisation's brand. Impersonation Protect applies ML to detect executive and VIP impersonation in emails — BEC protection targeting attacks on financial and senior employees. With enterprise deployment in financial services, legal, and healthcare, Mimecast validates for regulated industry email security and continuity.
Mimecast AI runs as ml platform software built around text and data workflows. Users typically start with a prompt, upload, or connected data source, and the underlying model handles the heavy lifting before returning a result you can refine or export. It's available on web, api, and email gateway.
The capabilities that matter most for teams evaluating Mimecast AI.
Alternate email infrastructure for Microsoft 365 and Google Workspace outages — ensuring business email operations continue uninterrupted during primary platform failures.
ML detection of executive and VIP impersonation in emails — BEC protection targeting financial and senior employee attacks.
Immutable compliance-grade email retention for legal hold and eDiscovery — regulatory email compliance alongside security protection from one platform.
Enterprise licensing. No public pricing. Annual contracts. Owned by Permira (private). Demo available.
Model
Enterprise
Starting price
Free
Free trial
Yes
Proofpoint (rank 915) provides competing enterprise email security. Microsoft Defender provides email security within Microsoft. Darktrace (covered) provides AI email security. Barracuda (rank 917) provides SMB to mid-market email security.
A side-by-side look at the closest alternative in this category.
Key facts about model providers, platforms, and team support.
Model Provider
Mimecast
Platforms
Web, API, Email gateway, Outlook plugin
Deployment
SaaS
Integrations
Microsoft 365, Google Workspace, Active Directory, SIEM, API
Team Collaboration
No
Launch Year
2022
Compliance signals and data-handling notes as reported by the vendor.
SOC 2 Type II. ISO 27001. GDPR compliant. FedRAMP eligible. HIPAA eligible. Enterprise data handling agreements.
Email content and archive data processed on Mimecast cloud. Archive data maintained immutably for compliance retention requirements.
Editorial Verdict
Mimecast is a strong AI enterprise email security platform for regulated industries wanting AI threat detection, unique email continuity during outages, compliance archiving, and integrated awareness training.
Last verified July 24, 2026.
Enterprise licensing. No public pricing. Annual contracts. Owned by Permira (private). Demo available.
Enterprise licensing. No public pricing. Annual contracts. Owned by Thoma Bravo. Demo available.
SOC 2 Type II. ISO 27001. GDPR compliant. FedRAMP eligible. HIPAA eligible. Enterprise data handling agreements.
SOC 2 Type II. ISO 27001. GDPR compliant. FedRAMP authorised. HIPAA eligible. Enterprise data handling agreements.
Email content and archive data processed on Mimecast cloud. Archive data maintained immutably for compliance retention requirements.
Email content and threat intelligence data processed on Proofpoint cloud. FedRAMP for US government email security deployments.
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