What is Spamhaus?

**Spamhaus** is the most influential anti-spam organization, operating blocklists used by the majority of internet email systems. Founded in 1998, it tracks known spam operations, botnets, and compromised infrastructure globally.

**Spamhaus** blocklists include: **SBL** (**Spamhaus** Block List) for verified spam sources, **XBL** (Exploits Block List) for compromised systems, **PBL** (Policy Block List) for dynamic/residential IPs, and **DBL** (Domain Block List) for spam-associated domains.

Getting listed on **Spamhaus** severely impacts deliverability across most MBPs. Delisting requires demonstrating the problem is resolved. **Spamhaus** provides self-removal for some listings but may require manual review for serious cases. Avoiding **Spamhaus** listing through good practices is far easier than remediation.