Part of the MAPS (Mail Abuse Prevention System) relay blocklist family. MAPS was acquired by Trend Micro and the public free DNSBL service was discontinued. ...

Small independent DNSBL that has been discontinued. Historical reference only.

Right-hand side domain blocklist targeting sending domains and URLs found in spam. Checked against the domain in the From: header and links in the message ...

User-report-driven listing of IPs that sent spam to SpamCop trap addresses or were reported via the SpamCop submission interface. Widely integrated into spam ...

IP reputation list maintained by Barracuda Networks, fed by over 200,000 spam sensors globally. Used natively by Barracuda email security appliances and ...

Domain-level blocklist from SORBS flagging sending domains associated with abusive behaviour. Acquired by Proofpoint in 2011; maintenance has been inconsistent ...

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 ...

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 ...

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 ...