Mimecast

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

Enterprise Email GatewayCustom pricing / per-user licensing
How we work:This listing is aggregated from Mimecast's official documentation, public pricing pages, community discussions (Reddit, HN, forums), and real user feedback. We do not do hands-on testing. We aggregate and organize what's already out there. Last verified February 2026.

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
Cons
  • ✗ 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

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

Mimecast Comparisons

Mimecast vs Abnormal Security→Mimecast vs Trend Micro Email Security→Mimecast vs Barracuda Email Security→Mimecast vs IRONSCALES→Mimecast vs Tessian→Mimecast vs Proofpoint→Mimecast vs Cisco Secure Email→Mimecast vs Microsoft Defender for Office 365→
Quick Info
PricingCustom pricing / per-user licensing
ModelPer-user subscription
Founded2003
CloudYes
Self-HostedNo
Visit Website →

Last updated: Feb 20, 2026

Mimecast Alternatives
View All Alternatives
Proofpoint
Enterprise email security platform for advanced threat prote...Microsoft Defender for Office 365
Microsoft's native email security for Microsoft 365 with XDR...Abnormal Security
AI-powered email security platform specializing in behaviora...Barracuda Email Security
Email threat protection platform available as gateway applia...Cisco Secure Email
Enterprise email security gateway with Cisco Talos threat in...