Blacklists
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Return Path Blocklist (RPBL) FAQ
What is the Return Path Blocklist? The Return Path Blocklist (RPBL) is a list of IP addresses th...
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Return Path Blocklist (RPBL)
Overview The Return Path Blocklist’s (RPBL) algorithm identifies indicators of spam and abusive b...
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What is the difference between a blocklist and a blacklist?
While marketers still primarily use “blacklist”, “blacklisted”, or “blacklisting” to describe the...
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What is a botnet?
A botnet is a network of computer devices infected and controlled by an unauthorized third party ...
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What is a blacklist?
A blacklist is a list of IP addresses or domains that have been reported as known sources of spam...
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Which blacklists are most important to senders?
There are hundreds of blacklists available, but not all blacklists are created equal. Because any...
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Composite Blocking List (CBL)
Overview The Composite Blocking List (CBL) is a Domain Name System (DNS)-based blacklist. It incl...
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SpamCop Blocking List (SCBL)
Overview SpamCop is a spam reporting service that takes reports of spammers’ IPs addresses from r...
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Weighted Private Block List (WPBL)
Overview The Weighted Private Block List (WPBL) lists IP addresses that connect to WPBL members' ...
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What is Spamhaus?
Spamhaus is an international blacklisting organization that was founded in Europe in 1998 to trac...
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Spamhaus Block List (SBL)
Overview The Spamhaus Block List (SBL) is a list of IPs of spam sources, including known spammers...
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Spamhaus Policy Block List (PBL)
Overview The Spamhaus Policy Block List (PBL) is a list of all dynamic IP addresses and some stat...
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Spamhaus Composite Snowshoe (CSS) blacklist
Overview The Spamhaus Composite Snowshoe (CSS) blacklist uses proprietary data to identify IPs wi...
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Spamhaus Exploits Block List (XBL)
Overview The Spamhaus Exploits Block List (XBL) is a list of known open proxies and illegal third...
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What is the Spam Uniform Resource Identifier Real-time Block List (SURBL)?
The Spam Uniform Resource Identifier Real-time Block List (SURBL) is a collection of lists that i...
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LashBack's Unsubscribe Blacklist (UBL)
Overview LashBack's UBL includes the IP addresses of senders who send to email addresses harveste...
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Invaluement blacklist
The Invaluement blacklist is made up of three commercial anti-spam blacklists. Here are the three...
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Spam and Open Relay Blocking System (SORBS) Open Proxy blacklist
Overview The Spam and Open Relay Blocking System (SORBS) Open Proxy blacklist is a list of proxy ...
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Spam and Open Relay Blocking System (SORBS) DNSBL blacklist
Overview The Spam and Open Relay Blocking System (SORBS) DNSBL blacklist is a Domain Name System-...
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Spam and Open Relay Blocking System (SORBS) Dynamic User and Host List (DUHL) blacklist
Overview The Spam and Open Relay Blocking System (SORBS) Dynamic User and Host List (DUHL) blackl...
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Spam and Open Relay Blocking System (SORBS) HTTP blacklist
Overview The Spam and Open Relay Blocking System (SORBS) HTTP blacklist is a list of open Hyperte...
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Spam and Open Relay Blocking System (SORBS) Web blacklist
Overview The Spam and Open Relay Blocking System (SORBS) Web blacklist identifies web servers tha...
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Spam and Open Relay Blocking System (SORBS) Simple Mail Transfer Protocol (SMTP) blacklist
Overview The Spam and Open Relay Blocking System (SORBS) Simple Mail Transfer Protocol (SMTP) bla...
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Spam and Open Relay Blocking System (SORBS) Spam blacklist
Overview The Spam and Open Relay Blocking System (SORBS) Spam blacklist reports either single IP ...
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Spam and Open Relay Blocking System (SORBS) Block blacklist
Overview The Spam and Open Relay Blocking System (SORBS) Block blacklist includes IP addresses an...
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Spam and Open Relay Blocking System (SORBS) Zombie blacklist
Overview The Spam and Open Relay Blocking System (SORBS) Zombie blacklist is a list of networks t...
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Spam and Open Relay Blocking System (SORBS) MISC blacklist
Overview The Spam and Open Relay Blocking System (SORBS) MISC blacklist identifies miscellaneous ...
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Kempt blacklist
Overview The Kempt blacklist lists IP addresses that send spam through an open relay or to Kempt ...
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Barracuda Reputation Blacklist (BRBL)
Overview The Barracuda Reputation Blacklist (BRBL) listsIP addresses of servers that are poorly c...
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SpamCannibal blacklist
**The SpamCannibal blacklist is no longer in service. If you have old or more current listings on...