Server Racks and Data Wave

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Phishing and malicious emails are still the most common methods used by cyber criminals to infect company networks with malware, Trojans and ransomware.1

Malware-infected computers, controlled by bot herders, add to the global spam problem and are regularly deployed in DDoS attacks by hacktivists and cyber criminals.

Mail system administrators need to block spam without preventing legitimate emails from being received. Network administrators want to protect bandwidth for business-critical processes without expending excessive resources on filtering out spam.

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Organizations worldwide use Spamhaus DNSBLs to block the vast bulk of spam at the SMTP gateway, significantly reducing the time and cost of processing unsolicited and malicious email traffic.

Spamhaus DNSBL, ZEN, DBL, SBL, XBL, PBL, ZRD, DROP and eDROP are updated continuously. This arms ISPs, web hosts, network operators, mail service providers and telecom companies with real-time information about the origins of incoming emails and links contained within them: allowing them to block, accept or quarantine messages according to their own policies.

Incoming email sent from a DNSBL-listed domain or IP address can be blocked at the mail gateway or passed to a more granular filtering system. Best practice is to undertake staged filtering: first to remove obvious spam sent from known botnets and spammers’ IP addresses, followed by more meticulous analysis to identify emails containing malware or links to new websites that are controlled by spammers and cybercriminals.

Spamhaus Technology DNSBL datafeeds enable email service providers simply to remove the vast majority of spam before it gets anywhere near their customers' networks. False positives are extremely rare, which is why most of the world’s major email providers rely on these datafeeds, with 3 billion mailboxes protected worldwide.

1 Source: Verizon Data Breach Investigations Report 2015, page 53. http://www.verizonenterprise.com/uk/DBIR/2015/

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Realtime Block Lists (RBLs)

Zero Reputation Domains (ZRD)

Spamhaus DNS-based Block Lists (DNSBL) include the latest domains that are contained in spam emails and IP addresses that are sending spam.


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Many of the world’s largest internet service providers rely on Spamhaus threat intelligence to block harmful email traffic and protect their customers.

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