MimeCast Email Security

MimeCast Email Security is the email protection product from Mimecast. It guards mailboxes and collaboration tools against phishing, impersonation and malicious messages, and is positioned as an extra layer of protection alongside Microsoft 365 and Google Workspace.

What MimeCast Email Security offers

• Email threat protection — filters malicious mail and analyses unknown messages using machine learning.
• Encryption — protects sensitive email content.
• Email continuity — keeps mail flowing during an outage.
• Human risk management — addresses staff behaviour as a source of risk.
• Data loss prevention and communications governance — further products named on the vendor's site.

Who it works with

Organisations of various sizes, including small and medium businesses, that run Microsoft 365 or Google Workspace.

Key facts

• Platform: cloud-native, built to integrate with existing security tools
• Analyst recognition: named a Leader in a 2025 Gartner Magic Quadrant for email security, per its site
• Customer base: over 42,000 organisations, as the vendor states