No article in the knowledge graph for GreatHorn yet.
Who is GreatHorn?
GreatHorn is a cloud-native email security platform that focuses on protecting organizations from phishing, Business Email Compromise (BEC), and related email-borne threats across modern collaboration environments.
- Cloud-based email security platform for phishing and BEC protection (email security).
- Integrated protection for cloud email services such as Microsoft 365 and Google Workspace (email security).
- Detection and analysis of email threats using multiple context and content signals (threat detection).
- User-facing controls and alerts for security awareness and risk reduction within email workflows (security awareness).
- Administrative policy management, incident response workflows, and reporting for security teams (security operations).
Show more
More About GreatHorn
GreatHorn operates in the email security category, focusing on cloud-hosted environments where organizations use services such as Microsoft 365 and Google Workspace as core communication platforms. Its offerings are designed to integrate directly with these cloud email systems through APIs and native connectors rather than via legacy secure email gateways, enabling security teams to manage protection without rerouting mail through separate infrastructure. This architecture aligns with modern, cloud-first enterprise deployments in which email, productivity suites, and collaboration tools run as Software-as-a-Service (SaaS).
The platform analyzes multiple technical and contextual indicators to identify phishing, BEC, impersonation attempts, and other email-borne threats. These indicators can include sender and domain reputation, header anomalies, authentication results like SPF, DKIM, and DMARC (email authentication), relationship history between sender and recipient, message content and links, and other environment-specific metadata. By using these layers of analysis, GreatHorn supports classification and risk scoring of messages that pass basic gateway or provider-level filters.
GreatHorn typically sits alongside existing cloud email infrastructure rather than replacing native email security controls. It connects via APIs to ingest message metadata, apply detection logic, and enforce policies such as quarantining, modifying subject lines, inserting banners, or providing in-line user warnings. This approach allows deployment without Domain Name System (DNS) or MX record changes and supports operation in distributed, hybrid, or multi-tenant environments commonly found in enterprises and institutional settings.
From an operations perspective, the platform provides dashboards and tools for Security Operations (SecOps) center (SOC) analysts and email administrators to investigate threats, adjust policies, and perform remediation. Capabilities commonly include search across messages and users, bulk remediation actions, workflow support for responding to reported phishing, and reporting functions that surface trends in attack types, targeted departments, or recurring malicious senders. These functions place GreatHorn within the broader SecOps and security orchestration toolchain, often alongside Security Information and Event Management (SIEM) or Security Orchestration Automation Response (SOAR) platforms.
GreatHorn also incorporates user-facing elements intended to influence behavior at the point of interaction with email. These may include contextual banners within messages, warnings on suspicious links or attachments, and mechanisms for users to report suspected phishing directly from the email client. By bringing detection context into the inbox, the platform supports a combined technology and user-awareness approach to reducing successful phishing attempts.
In marketplace and directory taxonomies, GreatHorn aligns with categories such as cloud email security, phishing protection, BEC protection, and SecOps support for email environments. Its focus on API-based integration with Microsoft 365 and Google Workspace positions it within modern cloud-native security toolsets used by enterprises, mid-market organizations, and other institutions that rely on SaaS email and collaboration platforms as operational foundations.
Our description of GreatHorn. Updated December 2025.
