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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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...
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Spam and Open Relay Blocking System (SORBS) Simple Mail Transfer Protocol (SMTP) blocklist
Overview The Spam and Open Relay Blocking System (SORBS) Simple Mail Transfer Protocol (SMTP) blo...
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Spam and Open Relay Blocking System (SORBS) Spam blocklist
Overview The Spam and Open Relay Blocking System (SORBS) Spam blocklist reports either single IP ...
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Spam and Open Relay Blocking System (SORBS) Block blocklist
Overview The Spam and Open Relay Blocking System (SORBS) Block blocklist includes IP addresses an...
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Spam and Open Relay Blocking System (SORBS) Zombie blocklist
Overview The Spam and Open Relay Blocking System (SORBS) Zombie blocklist is a list of networks t...
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Spam and Open Relay Blocking System (SORBS) MISC blocklist
Overview The Spam and Open Relay Blocking System (SORBS) MISC blocklist identifies miscellaneous ...
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Kempt blocklist
Overview The Kempt blocklist lists IP addresses that send spam through an open relay or to Kempt ...
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Barracuda Reputation Block List (BRBL)
Overview The Barracuda Reputation Block List (BRBL) lists IP addresses of servers that are poorly...
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SpamCannibal blocklist
**The SpamCannibal blocklist is no longer in service. If you have old or more current listings on...