Blocklists
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Why is my IP address listed on the Return Path Blocklist and what can I do about it?
The Return Path Blocklist uses data sources from our partners and state of the art technology to ...
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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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URIBL blocklist
Overview The URIBL blocklist lists domains appearing in spam and is used with anti-spam software ...
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Truncate blocklist
Overview The Truncate blocklist identifies potential sources of spam, scams, viruses, and malware...
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SPFBL blocklist
Overview The SPFBL blocklist identifies potential sources of spam using reputation data collected...
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SpamRATS! blocklist
Overview SpamRATS! is a real-time blocklist used to identify spam originating from botnets and co...
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NoSolicitado blocklist
Overview The NoSolicitado blocklist uses a pristine spam trap network and other techniques to ide...
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HostKarma blocklist
Overview The HostKarma blocklist uses spam traps along with other spam detection techniques to id...
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Cloudmark CSI blocklist
Overview The Cloudmark CSI blocklist is owned an operated by Proofpoint. It uses a combination of...
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0Spam blocklist
Overview The 0Spam blocklist uses spam traps and other spam reporting services to identify possib...
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Spamhaus Domain Block List (DBL)
Overview The Spamhaus Domain Block List (DBL) is a list of domains of spam sources, including kno...
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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?
There is no difference between a blocklist and blacklist, and the terms are often used interchang...
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Which blocklists are most important to senders?
There are hundreds of blocklists available, but not all blocklists 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 blocklist. 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 blocklisting 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) blocklist
Overview The Spamhaus Composite Snowshoe (CSS) blocklist 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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Spam Uniform Resource Identifier Real-time Block List (SURBL)
Overview The Spam Uniform Resource Identifier Real-time Block List (SURBL) is a collection of pub...
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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 blocklist
The Invaluement blocklist is made up of three commercial anti-spam blocklists. ivmURI: This list...
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Spam and Open Relay Blocking System (SORBS) Open Proxy blocklist
Overview The Spam and Open Relay Blocking System (SORBS) Open Proxy blocklist is a list of proxy ...
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Spam and Open Relay Blocking System (SORBS) DNSBL blocklist
Overview The Spam and Open Relay Blocking System (SORBS) DNSBL blocklist is a Domain Name System-...
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Spam and Open Relay Blocking System (SORBS) Dynamic User and Host List (DUHL) blocklist
Overview The Spam and Open Relay Blocking System (SORBS) Dynamic User and Host List (DUHL) blockl...
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Spam and Open Relay Blocking System (SORBS) HTTP blocklist
Overview The Spam and Open Relay Blocking System (SORBS) HTTP blocklist is a list of open Hyperte...
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Spam and Open Relay Blocking System (SORBS) Web blocklist
Overview The Spam and Open Relay Blocking System (SORBS) Web blocklist identifies web servers tha...