Mimecast

Mimecast is a provider of cloud‑based email security and cyber resilience services that help organisations protect their communication channels from a range of threats. Its core offerings include email protection against phishing, malware, spam and impersonation attacks, email archiving for long‑term retention and compliance, email continuity to keep messaging available during outages, and security awareness training to reduce human risk. These services are delivered through a single, integrated platform that can be subscribed to on a software‑as‑a‑service basis, allowing customers to deploy protection without managing complex on‑premise infrastructure. By operating in the cloud, Mimecast can scale its protection to accommodate organisations of varying size, from small businesses to large multinational enterprises, across sectors such as finance, healthcare, legal, education and government. The platform is designed to work alongside existing email environments, including Microsoft 365 and Google Workspace, providing supplemental security layers that complement native controls. Through continuous monitoring and threat intelligence feeds, the service aims to detect and block malicious messages before they reach users’ inboxes.

What distinguishes Mimecast is its specialised focus on preventing email‑based impersonation and business‑email‑compromise schemes, employing proprietary authentication technologies and machine‑learning models to analyse sender behaviour and message content. The company maintains a global threat intelligence operation that collects data from a large volume of protected mailboxes, enabling rapid updates to detection rules in response to emerging campaigns. Mimecast’s collaboration with Microsoft was highlighted in the January 2021 incident, when a compromised security certificate was identified through joint investigation, revealing how attackers could misuse trusted connections to surveil customer communications. Headquartered in the United Kingdom, the firm operates data centres and support centres in multiple regions to ensure low latency and compliance with local data‑protection regulations. Its platform is often noted for delivering a unified approach to email security, archiving and continuity, reducing the need for disparate point solutions. By combining preventive controls with recovery capabilities, Mimecast positions itself as a provider of cyber resilience that helps organisations maintain trust in their email communications even when faced with sophisticated adversaries.