All-in-one email security, archiving, and continuity platform with 100% SLA uptime guarantee for Microsoft 365 and Google Workspace.
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Mimecast has built its market position on bundling three services that most enterprises buy separately: email security filtering, email archiving for compliance, and email continuity during outages. The integrated platform approach means administrators manage all three from a single console with unified policy controls rather than stitching together point solutions.
On the security side, Mimecast uses a multi-layered inspection pipeline — reputation filtering, sandboxing (Mimecast Threat Intelligence), URL protection with click-time scanning, and an impersonation protection engine that flags display-name spoofing and lookalike domains. The platform also offers internal email protect, scanning email sent between users within the same Microsoft 365 tenant to catch compromised account activity.
The archiving module captures a tamper-proof copy of every email in Mimecast's cloud infrastructure, with legal hold and e-discovery search built in. For regulated industries (financial services, healthcare, legal), this eliminates the need for a separate archiving solution.
Continuity is Mimecast's differentiator against pure-play email security vendors. If Microsoft 365 goes down, Mimecast routes email through its own infrastructure and provides a lightweight webmail interface so users can continue sending and receiving. The company guarantees 100% availability for inbound email delivery.
Pricing starts at approximately $4.50/user/month for Protect (security only) and scales to $9–$12/user/month for bundles that include archiving and continuity. Mimecast is best evaluated alongside Proofpoint and Barracuda for mid-market organizations with 100–5,000 mailboxes.
Procurement checklist for Mimecast Email Security: confirm the current pricing and plan limits on the official pricing page, then validate the feature tier against your team size, data-retention needs, integration requirements, and support expectations. For Email Security buyers considering Mimecast Email Security, the practical questions are whether the product fits the current workflow, whether administrators can configure it without heavy consulting, and whether the vendor's documentation supports the claims used in this review. If Mimecast Email Security will handle regulated or customer-sensitive data, review its data-processing agreement, security documentation, access controls, and export options before committing. Use the linked official sources and a trial or proof of concept for final validation of Mimecast Email Security; do not treat this review as a private hands-on test claim.
A standardized buyer checklist for every product page, avoiding unsupported hands-on testing claims.
Important details to help you make the right choice
Best for mid-market organizations needing email security, archiving, and continuity in one bundle
Not the best fit for very small teams under 50 users — the archiving and continuity value is harder to justify at that scale.
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Mimecast offers a free trial for its Email Security services, typically available for 30 days upon request through their sales team. The starting price for the Protect plan is $4.50 per user per month, which includes multi-layer threat filtering and URL sandboxing. Higher tiers add archiving and continuity features at additional cost.
The primary use case is protecting organizations from email-borne threats such as phishing, malware, and ransomware while ensuring business continuity during email outages. Mimecast also serves as a compliance archiving solution with 7-year retention and legal hold capabilities. It is designed to replace or augment native security in Microsoft 365 and Google Workspace.
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Pricing source: Official pricing page — Last verified: 4/26/2026
Mimecast is best suited for mid-sized to large enterprises that need an all-in-one platform combining email security, archiving, and continuity. It is particularly valuable for organizations in regulated industries like finance and healthcare that require long-term email retention and e-discovery tools. Small businesses may find the pricing and feature set more than they need.
Mimecast integrates via API and MX record changes to route email through its security layer before delivery to Microsoft 365 or Google Workspace. Setup typically takes a few hours to a day, with guided wizards and documentation provided. The platform supports single sign-on (SSO) and directory synchronization for user management.
Independent tests from organizations like Gartner and SE Labs indicate that Mimecast's threat detection accuracy slightly trails Proofpoint, particularly against advanced targeted attacks. Additionally, the user interface is considered less modern than some cloud-native competitors. However, Mimecast compensates with bundled archiving and a 100% uptime SLA.
