Secure Your Business Communications with Mimecast Solutions

Evaluating an enterprise email security solution requires looking beyond simple spam filtering. Mimecast has evolved into a comprehensive "Work Protected" platform that addresses the three primary vectors of modern risk: the email gateway, the human element, and the broader cloud ecosystem. This guide provides a detailed breakdown of Mimecast’s capabilities, ranging from its AI-powered threat protection to its immutable cloud archiving.

As organizations face an escalation in Business Email Compromise (BEC) and sophisticated supply chain attacks, Mimecast offers a layered defense strategy. This document is designed for IT directors, CISOs, and security architects to understand Mimecast’s technical requirements, integration potential, and the specific business scenarios where it outperforms native cloud mail security. By the end of this guide, you will have the necessary criteria to determine if Mimecast is the right fit for your organization’s risk profile and operational needs.

Mimecast’s platform is built around four core pillars of functionality:

• Advanced Threat Protection: Utilizing "CyberGraph" AI to detect anomalies in communication patterns, blocking zero-day phishing, and providing "Targeted Threat Protection" which includes real-time URL re-writing and attachment sandboxing.
• Email Continuity: Keeps employees productive during Microsoft 365 or on-premises Exchange outages by providing a secondary pathway for email through the Mimecast web portal, mobile app, or Outlook plugin.
• Cloud Archiving: An immutable, encrypted, and bottomless cloud archive that provides lightning-fast search for end-users and comprehensive eDiscovery/litigation hold capabilities for legal teams.
• Security Awareness Training (AT): Integrated video-based training that uses humor and short modules to engage employees, coupled with phishing simulations that use real-world de-weaponized attacks.
• DMARC Analyzer: Simplifies the complex process of managing DMARC, SPF, and DKIM records to protect brand reputation and prevent domain spoofing.
• Internal Email Protect: Scans internal-to-internal traffic to prevent the lateral movement of threats from compromised internal accounts.

Mimecast is utilized across diverse industries to solve specific security gaps:

• Financial Services (Compliance & eDiscovery): A global bank uses Mimecast to maintain a 7-year immutable archive of all communications, allowing their legal team to perform complex eDiscovery searches in seconds rather than days during regulatory audits.
• Healthcare (Ransomware Prevention): A hospital network utilizes Mimecast’s "Attachment Protection" to sandbox all incoming resumes and medical records, successfully neutralizing several Emotet variants before they could reach the endpoint.
• Manufacturing (Supply Chain Protection): A manufacturer uses "CyberGraph" to detect "look-alike" domains from fake suppliers, preventing fraudulent wire transfer requests that native filters missed.
• Legal (Large File Send): A law firm replaces insecure consumer-grade file sharing with Mimecast’s "Large File Send," allowing attorneys to securely send encrypted 2GB+ files directly from Outlook.
• Public Sector (Continuity): A city government ensures that emergency services can still communicate via email during a planned Microsoft 365 maintenance window or unplanned outage. drug.

Mimecast typically utilizes a per-user, per-month subscription model. Pricing is tiered based on the "Bundle" selected:

• The Core Drivers: The number of mailboxes (seats) is the primary driver. Note that Mimecast usually requires licensing for all active users in the directory, not just a subset.
• Bundle Tiers: Packages range from "Core" (Basic security) to "Hero" or "Mega" bundles (including Archiving, Continuity, and Awareness Training).
• Add-on Costs: Specific features like Large File Send, DMARC Analyzer, or historical data ingestion (Legacy Archive Migration) often incur additional one-time or recurring fees.
• Data Volume: While archiving is "bottomless" for most tiers, there may be specific limits or surcharges for extremely high-volume historical data migrations.
• Commitment: Standard contracts are 1-3 years, with significant discounts available for multi-year commitments.

Mimecast is a cloud-native platform, but it requires specific environmental configurations:

• Mail Environment: Compatible with Microsoft 365, Google Workspace, and on-premises Exchange (2013, 2016, 2019) or hybrid setups.
• Network: Outbound connectivity on Port 25 (SMTP) and Port 443 (HTTPS) to Mimecast data centers.
• Endpoints: For the Mimecast Outlook Add-in, Windows 10/11 and supported versions of Microsoft Office are required. Mac users utilize the Mimecast for Mac app.
• Browsers: Support for the latest versions of Chrome, Edge, Firefox, and Safari for the Administration Console and Personal Portal.
• Authentication: Requires a method for directory sync (LDAP, LDAPS, or Azure AD Sync) and ideally a SAML-based IdP for SSO.

To successfully deploy Mimecast, organizations should meet the following business prerequisites:

• DNS Control: Access to and authority over the organization’s DNS records (MX, SPF, DKIM) is mandatory for routing traffic through the Mimecast gateway.
• Stakeholder Alignment: Buy-in from IT Operations (for mail flow), Security (for policy definition), and Legal/Compliance (for archiving and eDiscovery requirements).
• Change Management: A plan for communicating with end-users regarding new quarantine digests, the Mimecast Outlook plugin, and potential changes in how external emails are flagged.
• Security Training Readiness: If opting for the Awareness Training module, a designated program manager is needed to oversee campaign cadences and remedial training paths.
• Policy Review: An existing understanding of internal data handling policies to properly configure Data Loss Prevention (DLP) triggers.

A typical Mimecast implementation follows a 4-to-12 week trajectory depending on complexity:

• Phase 1: Discovery & Planning (Weeks 1-2): Identifying mail flow, defining firewall rules, and auditing existing blacklists/whitelists.
• Phase 2: Core Setup (Weeks 2-3): Configuring the Mimecast Administration Console, setting up directory synchronization (AD/Azure AD), and configuring outbound/inbound connectors.
• Phase 3: Policy Configuration (Weeks 3-5): Setting up URL protection, attachment sandboxing, and DLP policies. This often involves a "monitoring mode" to ensure no false positives.
• Phase 4: Migration & Archiving (Weeks 4-10): If applicable, legacy data ingestion into the Mimecast Cloud Archive. This timeframe varies wildly based on data volume.
• Phase 5: Go-Live & Training (Weeks 6-12): Switching MX records, deploying end-user apps/plugins, and conducting admin training.

Mimecast offers a tiered support structure to meet different organizational needs:

• Standard Support: Included with all subscriptions, providing 24/5 web and phone support for technical issues and access to the "Mimecaster Central" community and knowledge base.
• Priority Support: Offers 24/7/365 access to senior support engineers with faster guaranteed response times and proactive system monitoring.
• Professional Services: Available for complex migrations, initial architectural design, and custom API development.
• Customer Success Managers (CSM): Assigned to enterprise accounts to ensure platform health, conduct business reviews, and assist with feature adoption.
• Managed Services: Mimecast also partners with a vast network of MSPs who can provide fully managed email security operations for smaller IT teams.

Mimecast is designed to sit at the center of a security ecosystem with the following integration capabilities:

• Directory Services: Seamless integration with Active Directory, Azure AD (Entra ID), and Google Directory for automated user provisioning.
• SIEM/SOAR Integration: Pre-built connectors for Splunk, Microsoft Sentinel, IBM QRadar, and Palo Alto Cortex XSOAR to feed email threat intelligence into broader security operations.
• API Access: A robust REST API (MimeOS) allows for custom integrations, automated threat hunting, and programmatic policy updates.
• Identity Providers: Support for SAML 2.0 (Okta, Ping, Azure AD) for Single Sign-On (SSO) into the Mimecast administration console and end-user applications.
• Endpoint Security: Bi-directional intelligence sharing with vendors like CrowdStrike and SentinelOne to correlate email threats with endpoint activity.

Mimecast maintains a "Security First" posture with extensive certifications:

• Certifications: SOC 2 Type II, ISO 27001, ISO 27018, ISO 22301, and HIPAA compliance readiness.
• Public Sector: Mimecast is FedRAMP Authorized (Moderate), making it suitable for US government agencies and contractors.
• Data Residency: Multiple global data centers allow customers to select specific regions (US, UK, EU, AU, CA, etc.) to meet strict data sovereignty requirements.
• Encryption: All data is encrypted at rest and in transit using AES-256 and TLS 1.2+.
• Privacy Controls: Robust role-based access control (RBAC) and audit logging ensure that administrators only see the data they are authorized to view.