The SynRBL (Synametrics - Realtime Blackhole List) 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, Synametrics RBL also lists servers with dynamically allocated IP addresses.
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If anyone would like to contribute to Synametrics RBL or has any suggestions for new detection routines, and/or hosts to be listed, the Synametrics RBL team would love to hear from you. Please use the Mail/Contact Form to get in touch and discuss your thoughts.