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EAST Anti-Phishing Tool is a free anti-phishing tool by Eye Security. Mimecast DMARC Analyzer is a commercial anti-phishing tool by Mimecast. Compare features, ratings, integrations, and community reviews side by side to find the best anti-phishing fit for your security stack.
CST VerdictBased on our analysis of NIST CSF 2.0 coverage, core features, integrations, company size fit, here is our conclusion:
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.
Organizations that need to stop domain spoofing at the authentication layer should use Mimecast DMARC Analyzer, particularly if your team lacks deep DNS expertise; the record setup wizard and managed services handle the heavy lifting that usually trips up smaller security shops. The tool covers all three authentication protocols (SPF, DKIM, BIMI) with real-time monitoring and forensic reporting that actually tracks source IP and geography, which matters when you're investigating which attacker is abusing your domain. Skip this if you're already running mature DMARC infrastructure with in-house policy tuning capability; the value proposition softens once you've moved past initial implementation.
Free anti-phishing tool for M365 that deploys via a custom CSS file in Entra.
DMARC implementation & monitoring tool to prevent domain spoofing attacks
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Common questions about comparing EAST Anti-Phishing Tool vs Mimecast DMARC Analyzer for your anti-phishing needs.
EAST Anti-Phishing Tool: Free anti-phishing tool for M365 that deploys via a custom CSS file in Entra. built by Eye Security. headquartered in Netherlands. 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..
Mimecast DMARC Analyzer: DMARC implementation & monitoring tool to prevent domain spoofing attacks. built by Mimecast. headquartered in United Kingdom. Core capabilities include DMARC record setup wizard, Real-time email authentication monitoring, User-friendly DMARC report console..
Both serve the Anti-Phishing market but differ in approach, feature depth, and target audience.
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