IP reputation list maintained by Barracuda Networks, fed by over 200,000 spam sensors globally. Used natively by Barracuda email security appliances and optionally by any MTA via DNSBL query.
Domain-level blocklist from SORBS flagging sending domains associated with abusive behaviour. Acquired by Proofpoint in 2011; maintenance has been inconsistent since. Some filters still query it.
Three-level IP blocklist covering individual IPs (Level 1), ASN ranges with high spam ratios (Level 2), and entire ASN blocks (Level 3). Known for aggressive listing policies and paid express…
Lists domains appearing in spam message bodies — not the sending domain, but the URLs the message links to. Queried by SpamAssassin and many commercial filters during content scanning.
Passive Spam Block List: lists IPs that send mail to its spam trap network. Removal is automatic once spam stops. No active maintenance required from operators.
Multi-component blocklist covering IPs involved in spam, malware distribution, and exploit activity. Includes separate zones for spam, exploits, and domain abuse. Widely used by enterprise mail ...
Reputation-based DNSBL combining spam trap data and complaint signals. Also operates a whitelist (wl.mailspike.net) for senders with verified good sending practices.
Scandinavian-origin DNSBL focused on spam sources identified via trap networks. Used as a scoring component in some Nordic mail infrastructure.
Sender Score reputation network from Validity. Assigns IPs a reputation score (0-100) rather than a binary listed/not-listed verdict. Used by major ESPs and filtering systems.
Formerly listed phishing and spam sources. Discontinued around 2013. DNS queries return NXDOMAIN. Historical reference only.
South African-origin DNSBL family covering IP (ivmsip), 24-hour recent spam (ivmsip24), and URI (ivmuri) zones. Primarily deployed in African and regional mail infrastructure.
Karma-based IP reputation system from JunkEmailFilter. Positive karma for good senders (whitelist), negative karma for spam sources (blacklist). Also operates a yellow zone for unknown senders.