Automated blocklist fed by fail2ban reports from a network of participating servers. Lists IPs involved in brute-force attacks, SSH scans, and other network intrusion attempts in addition to email ...
Formerly a sender certification and reputation list from Habeas (acquired by Return Path). Discontinued when Return Path moved to different certification models.
Lists IPs operating as botnet drones, open proxies, and compromised hosts. Oriented toward IRC network abuse but used in some mail filter configurations.
Family of IP blocklists covering dynamic IPs (RATS-Dyna), confirmed spam sources (RATS-Spam), and IPs with no PTR record (RATS-NoPtr). Used in SpamAssassin and Postfix configurations.
Swiss academic network blocklist covering spam sources and worm-infected hosts. Used within the Swiss and European academic mail infrastructure.
Formerly listed open relays (RELAYS zone) and uncertain mail sources (UNSURE zone). Has not been actively maintained since the mid-2010s. Still queried by some legacy SpamAssassin configurations.
Lists known Tor exit nodes. Not a spam blocklist but used by some mail servers to flag or reject mail from anonymous Tor network infrastructure.
Brazilian-origin blocklist combining SPF-based sender validation with traditional DNSBL listing. Lists IPs that fail SPF checks or are associated with spam sources in the SPFBL network.
Finnish blocklist covering spam sources identified via local trap networks. Primarily used by Finnish ISPs and regional mail infrastructure.
Reference catalog of 47 DNS-based email blocklists. Each entry covers what the list targets, how it affects SMTP delivery, and how to request removal.
Composite zone combining SBL (spam sources), XBL (exploited IPs), and PBL (policy block list) into a single DNSBL query. The most widely deployed IP blocklist in the world. A listing…
Every commercial email is governed by an unsubscribe law somewhere. Twelve jurisdictions publish specific standards with penalties from $53,088 per email (US) to €20M or 4% of turnover (EU). Since ...