Mimecast Email Security API
Mimecast REST API for cloud email security and cyber resilience platform. Enables AI agents to manage threat event queuing and SIEM integration for email attacks, handle email hold and release workflow automation, access email archiving and compliance search, retrieve anti-spoofing and impersonation protection configuration, manage URL protection and link analysis data, handle email DLP policy management and violation reporting, access threat intelligence and IOC data from email threats, retrieve audit log and usage reporting data, manage directory sync and user provisioning, and integrate email threat data with SOAR, SIEM, and ticketing platforms.
Score Breakdown
⚙ Agent Friendliness
🔒 Security
Email security platform. SOC2, ISO27001, GDPR. OAuth2 + HMAC. Multi-region. Email threat intelligence and security event data.
⚡ Reliability
Best When
An enterprise using Mimecast for email security wants AI agents to automate threat event processing, SIEM integration, phishing response workflows, archive search, and threat intelligence correlation.
Avoid When
SECURITY RISK: Automated email release workflows must require human approval for suspected phishing — automated release of malicious email creates security incidents. URL rewriting bypass automation could expose users to malicious links.
Use Cases
- • Streaming email threat events to SIEM from security operations agents
- • Automating phishing email hold and release from incident response agents
- • Accessing email threat intelligence from threat hunting agents
- • Managing email archiving and compliance search from legal and compliance agents
Not For
- • Email delivery and marketing automation without security focus
- • Internal email routing without cloud email security gateway requirements
- • Consumer email security without enterprise email gateway context
Interface
Authentication
Mimecast uses OAuth 2.0 and application-level API key authentication. Application ID and key with HMAC signature for legacy API; OAuth 2.0 for newer APIs. Developer portal at developer.services.mimecast.com. No native webhooks — uses SIEM event queue polling. SDKs for Python and Node.js. Threat Event Queue for real-time event streaming.
Pricing
Lexington, Massachusetts. Founded 2003. Permira-backed (private, 2021, $5.8B). Email security and cyber resilience platform. 40,000+ customers, 17M+ protected users. Strong email archiving and compliance. Security Awareness Training module. Competes with Proofpoint and Abnormal Security for email security.
Agent Metadata
Known Gotchas
- ⚠ SECURITY RISK: Email hold and release automation must require human approval for suspected phishing — automated release creates risk
- ⚠ Dual auth models — legacy HMAC-signed API key vs newer OAuth 2.0; some endpoints only available via legacy auth
- ⚠ No public MCP server — REST API via developer portal requiring Mimecast subscription
- ⚠ Event queue polling — no native webhooks; poll SIEM event queue with backoff to avoid rate limits
- ⚠ HMAC signature required for legacy API — timestamp-based signatures with short validity window; clock skew causes auth failures
- ⚠ Regional API endpoints — EU, US, UK regions have separate API endpoints; use customer-specific base URL
Alternatives
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Scores are editorial opinions as of 2026-03-07.