The Spam and Open Relay Blocking System
The SORBS (Spam and Open Relay Blocking System) provides free access to its DNS-based Block List (DNSBL) to effectively block email from more than 12 million host servers known to disseminate spam, phishing attacks and other forms of malicious email. The list typically includes email servers suspected of sending or relaying spam, servers that have been hacked and hijacked, and those with Trojan infestations. In an attempt to provide preemptive protection, SORBS also lists servers with dynamically allocated IP addresses. SORBS maintains 17 distinct DNSBL zones.
recent.dnsbl.sorbs.net typically includes email servers suspected of sending or relaying spam, servers that have been hacked and hijacked, and those with Trojan infestations. This blacklist is identical to new.dnsbl.sorbs.net, and also includes in its entirety all the data in new.spam.sorns.net. However, it also expands the list to include hosts that have been seen sending spam within the last 28 days. The same conditions and rules apply to this blacklist as do those of new.spam.dnsbl.net.