Company Overview
Spamhaus was founded in 1998 by Steve Linford in London, UK, and is now headquartered in Andorra la Vella, Andorra, with an operations center in Geneva, Switzerland. It is a non-profit organization operating the world's largest anti-spam DNSBL (DNS-based Blocklist) infrastructure, dedicated to protecting global email infrastructure from spam, phishing attacks, and malware.
Spamhaus operates the most widely deployed DNS blocklists on the internet, analyzing over 7.5 million IP addresses and 3 million domains daily, protecting approximately 4.5 billion mailbox users worldwide. Its free DNSBLs are integrated by tens of thousands of mail servers and ISPs globally, while commercial threat intelligence data is distributed through its partner Spamhaus Technology Ltd.
Related providers:
- 🛡️ Spamhaus Email Security (Anti-spam and threat intelligence service)
Core Products
| Product Name | Type | Description |
|---|---|---|
| Spamhaus Blocklist (SBL) | DNSBL | Real-time blocklist for known spam source IPs |
| Exploits Blocklist (XBL) | DNSBL | Real-time blocklist for hijacked zombie computers and open proxies |
| Policy Blocklist (PBL) | DNSBL | Policy blocklist restricting IP ranges not authorized to send mail directly |
| Domain Blocklist (DBL) | DNSBL | Blocklist for spam-related domains |
| ZEN (Zen) | Combined Query | Unified SBL + XBL + PBL query interface for one-stop anti-spam detection |
| DROP List (DROP/EDROP) | Route Blocking | "Don't Route Or Peer" lists for firewall and routing equipment traffic blocking |
| Data Feed Service (DFS) | Data Subscription | Structured threat intelligence data feed for enterprise customers |
| Spamhaus Threat Intelligence | Threat Intelligence | Advanced threat intelligence analysis platform providing IoCs |
| Spamhaus Malware Filter | Malware Filter | DNS-level malware domain filtering protection |
Competitors
| Competitor | Type | Description |
|---|---|---|
| Barracuda Networks | Email Security Gateway | Anti-spam, email security gateway, and web security solutions |
| Proofpoint | Enterprise Email Security | Enterprise email security, threat protection, and compliance platform |
| Mimecast | Cloud Email Security | Cloud email security archiving and business continuity services |
| Cisco Talos | Threat Intelligence | Cisco's threat intelligence team maintaining email reputation systems |
| SpamAssassin | Open Source Anti-Spam | Apache open-source rule-based email filtering engine |
| ReturnPath (Validity) | Email Reputation | Email deliverability optimization and sender reputation monitoring |
Key Milestones
- 1998: Founded by Steve Linford in London, began tracking spam sources
- 2001: Spamhaus Block List (SBL) officially launched, becoming a major global anti-spam data source
- 2005: Launched XBL (Exploits Block List) targeting botnet-controlled computers
- 2007: Released PBL (Policy Block List) in partnership with ISPs to block unauthorized sending IPs
- 2010: Launched DBL (Domain Block List) extending spam detection to the domain level
- 2013: Survived the largest DDoS attack in history at the time (peak 300 Gbps), defended with Cloudflare
- 2015: Released Spamhaus Malware Filter covering malware domain blocking
- 2020: Launched Spamhaus Threat Intelligence platform for advanced threat analysis
- 2026: Continues to operate the world's largest DNSBL network, analyzing billions of data points daily to protect global email infrastructure
