Mimecast

Cloud email security platform with threat protection, archiving, and continuity

ToolEnterprise Email GatewayCloud

Pricing: Custom pricing / per-user licensing

Reviewed by the CyberSecTool editorial team against the public sources cited below · Last reviewed February 2026 · How we review listings

What is Mimecast?

Mimecast is a cloud-based email security platform that provides comprehensive protection against advanced email threats including phishing, ransomware, impersonation attacks, and business email compromise. Its Targeted Threat Protection suite uses multiple detection layers including URL rewriting, attachment sandboxing, and impersonation detection to block threats before they reach the inbox. Mimecast also offers email continuity, archiving, and security awareness training, positioning it as a direct competitor to Proofpoint across the full email security lifecycle.

Best for: Mid-to-large enterprises wanting a unified email security, archiving, and continuity platform with strong API integrations
Pros
  • ✓ Email continuity keeps mail flowing during outages. Unique differentiator
  • ✓ Strong impersonation and brand protection capabilities
  • ✓ Unified platform covering security, archiving, and continuity
  • ✓ Good API ecosystem for SIEM and SOAR integrations
  • ✓ Easier administration compared to Proofpoint for mid-market teams
Considerations
  • • Detection efficacy slightly behind Proofpoint for advanced threats
  • • Email archiving search performance can be slow on large datasets
  • • Pricing is still premium and comparable to Proofpoint
  • • URL rewriting can break some legitimate links
  • • Security awareness training less mature than dedicated platforms

Reported in public reviews and vendor documentation. See sources below.

Key Features

→Targeted Threat Protection (URL, attachment, impersonation)
→Email continuity and failover
→Cloud-based email archiving
→Security awareness training
→DMARC management and brand protection
→Secure messaging and large file send
→API-based integrations with SIEM and SOAR
→Data loss prevention policies

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Mimecast Comparisons

Mimecast vs Proofpoint→Mimecast vs Abnormal Security→Mimecast vs Trend Micro Email Security→Mimecast vs Barracuda Email Security→Mimecast vs IRONSCALES→Mimecast vs Tessian→Mimecast vs Cisco Secure Email→Mimecast vs Microsoft Defender for Office 365→

Sources & references

Where the information on this listing comes from. Always verify pricing and capabilities against the vendor before a purchasing decision.

Mimecast — official websitePrimary source
Mimecast Company / About
Official site
Mimecast - Wikipedia
Wikipedia
Mimecast Trust Center - Certification and Attestation
Official Trust Center

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Quick Info
PricingCustom pricing / per-user licensing
ModelPer-user subscription
Founded2003
CloudYes
Self-HostedNo
Visit Website →

Last updated: Feb 20, 2026

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Certifications
ISO 27001SOC 2 Type IIISO 27701
In the glossary
Email Security