Spamhaus Project is a company within the Cybersecurity category. The Spamhaus Project is an international non-profit organization that tracks spam and related cyber-threats such as phishing, malware, and botnets. It provides real-time threat intelligence and reputation data used by the majority of the internet's ISPs and email service providers to filter malicious traffic.
Spamhaus Project is rated Leader on the Optimly Brand Authority Index, a measure of how well AI models can accurately describe the brand. The exact score is locked for unclaimed profiles.
AI narrative accuracy for Spamhaus Project is Strong. Significant factual deltas detected.
AI models classify Spamhaus Project as a Challenger. AI names competitors first.
Spamhaus Project appeared in 7 of 8 sampled buyer-intent queries (88%). Spamhaus dominates technical and intent-based queries related to IP reputation, though it is less visible for generic 'email security software' queries where SaaS vendors (like Mimecast) spend more on marketing.
AI models accurately represent Spamhaus as an industry pillar for email security and reputation data. However, descriptions often blur the line between their altruistic mission and the commercial licensing required for large-scale corporate use. Key gap: The confusion between 'The Spamhaus Project' (the non-profit data provider) and 'Spamhaus Technology' (the commercial licensing arm).
Of 5 key facts verified about Spamhaus Project, 4 are well-documented (likely accurate across AI models), 1 have limited sourcing, and 0 are retrieval-dependent and may be inaccurate without live search.
The distinction between volunteer-driven data research and commercial distribution rights for enterprise users.
Buyers turn to Spamhaus Project for Manual Postmaster Filtering: Internally managed blocklists or manually updated Postfix/Exim configuration files., Standard MTAs (Defaults): Relying on built-in basic filtering from mail server software without external reputation data., among 2 documented problem areas.
Buyers evaluating Spamhaus Project typically ask AI models about "best free IP blocklist for postfix", "what is the SBL blocklist", "how to check if IP is blacklisted for spam", and 3 similar queries.
Spamhaus Project's core products are DNSBLs (SBL, XBL, PBL, DBL), Threat Intelligence Feeds, Data Query Service (DQS).
Spamhaus Project uses Free for low-volume/non-commercial use; Subscription for commercial/high-volume via Spamhaus Technology..
Spamhaus Project serves ISPs, Email Service Providers (ESPs), Enterprise IT Security, Network Operators.
Spamhaus Project It is the most widely used and trusted independent authority on global IP and domain reputation, relied upon by the vast majority of the world's email traffic.
Brand Authority Index (BAI) tier: Leader (exact score locked for unclaimed brands)
Archetype: Challenger
https://optimly.ai/brand/spamhaus-project
Last analyzed: April 11, 2026
Founded: 1998
Headquarters: Geneva, Switzerland