EAST Anti-Phishing Tool vs GreatHorn Mailbox Intelligence: Side-by-Side Comparison (2026)

EAST Anti-Phishing Tool: Free anti-phishing tool for M365 that deploys via a custom CSS file in Entra. built by Eye Security. Core capabilities include Credential phishing protection for Microsoft 365 environments, Custom CSS file deployment via Microsoft Entra Portal, Email-based delivery of installation instructions and CSS file..

GreatHorn Mailbox Intelligence: Email security tool empowering users to identify & report phishing threats. built by GreatHorn. Core capabilities include Visual sender and domain trustworthiness indicators, In-email banner notifications for suspicious messages, User-initiated phishing reporting capabilities..

Both serve the Anti-Phishing market but differ in approach, feature depth, and target audience.

EAST Anti-Phishing Tool differentiates with Credential phishing protection for Microsoft 365 environments, Custom CSS file deployment via Microsoft Entra Portal, Email-based delivery of installation instructions and CSS file. GreatHorn Mailbox Intelligence differentiates with Visual sender and domain trustworthiness indicators, In-email banner notifications for suspicious messages, User-initiated phishing reporting capabilities.

EAST Anti-Phishing Tool is developed by Eye Security. GreatHorn Mailbox Intelligence is developed by GreatHorn. Vendor maturity, funding stage, and team size can be important factors when evaluating long-term viability and support quality.

EAST Anti-Phishing Tool integrates with Microsoft 365, Microsoft Entra. GreatHorn Mailbox Intelligence integrates with Microsoft 365, Google Workspace. Check integration compatibility with your existing security stack before deciding.

EAST Anti-Phishing Tool and GreatHorn Mailbox Intelligence serve similar Anti-Phishing use cases: both are Anti-Phishing tools, both cover Microsoft 365. Key differences: EAST Anti-Phishing Tool is Free while GreatHorn Mailbox Intelligence is Commercial. Review the feature comparison above to determine which fits your requirements.