Mimecast Pricing, Plans & Alternatives (2026)

Overview

Mimecast was founded in 2003 and is headquartered in London; it says it serves more than 42,000 organisations and 27 million users in more than 100 countries^[5]. Its Advanced Email Security product can be deployed in two ways. In MX-based deployment all incoming mail routes through Mimecast’s gateway, which intercepts threats inline and can keep mail flowing if the primary mail server is down; in API-based deployment Mimecast connects to the cloud mail platform without MX changes or disruption to mail flow^[6]. Detection uses anomaly detection with social graphing, advanced sandboxing, on-click protection and computer vision to identify brand and login-page impersonation, and contextual banners warn users about QR-code phishing and business email compromise^[6]. Mimecast supports Microsoft 365, Google, on-premises and hybrid environments, and integrates with SIEM and XDR platforms and named partners such as CrowdStrike, Netskope and Palo Alto Networks XSOAR^[6]. It cites Leader placement in Gartner’s 2025 Magic Quadrant for Email Security. Prices are quote-based, and the continuity feature that distinguishes the gateway option is not available in API-only mode^[6].