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

EAST Anti-Phishing Tool

Microsoft 365 administrators managing credential phishing at organizations under 5,000 users will find real value in EAST Anti-Phishing Tool because the CSS-based deployment model actually stops phishing pages from rendering correctly on your own login portal, blocking the attack before users even type credentials. The free model with no per-seat licensing means you get Entra-native protection without budget negotiation; deployment takes under an hour through the portal interface. Skip this if your environment runs hybrid identity systems outside pure Entra or if you need detection and response capabilities beyond the login page itself.

GreatHorn Mailbox Intelligence

Teams running Microsoft 365 or Google Workspace who need users to actually catch phishing will find GreatHorn Mailbox Intelligence worthwhile, because the visual sender indicators and on-click URL analysis force friction into the attack chain where it matters most. The tool scores across all three NIST Detect and Awareness categories, with particular strength in DE.CM continuous monitoring and real-time risk assessment that surfaces threats before the user opens them. Skip this if your organization has already deployed a mature endpoint detection layer and expects email security to handle lateral movement detection; GreatHorn prioritizes the user reporting loop and initial threat identification, not forensic analysis of compromise.