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  1. Validity Help Center
  2. Mailbox providers & blocklists
  3. Blocklists

Blocklists

  • 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 ...

  • Return Path Blocklist (RPBL) FAQ

    What is the Return Path Blocklist?  The Return Path Blocklist (RPBL) is a list of IP addresses th...

  • URIBL blocklist

    Overview The URIBL blocklist lists domains appearing in spam and is used with anti-spam software ...

  • Truncate blocklist

    Overview The Truncate blocklist identifies potential sources of spam, scams, viruses, and malware...

  • SPFBL blocklist

    Overview The SPFBL blocklist identifies potential sources of spam using reputation data collected...

  • SpamRATS! blocklist

    Overview SpamRATS! is a real-time blocklist used to identify spam originating from botnets and co...

  • NoSolicitado blocklist

    Overview The NoSolicitado blocklist uses a pristine spam trap network and other techniques to ide...

  • HostKarma blocklist

    Overview The HostKarma blocklist uses spam traps along with other spam detection techniques to id...

  • Cloudmark CSI blocklist

    Overview The Cloudmark CSI blocklist is owned an operated by Proofpoint. It uses a combination of...

  • 0Spam blocklist

    Overview The 0Spam blocklist uses spam traps and other spam reporting services to identify possib...

  • Spamhaus Domain Block List (DBL)

    Overview The Spamhaus Domain Block List (DBL) is a list of domains of spam sources, including kno...

  • Return Path Blocklist (RPBL)

    Overview The Return Path Blocklist’s (RPBL) algorithm identifies indicators of spam and abusive b...

  • 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...

  • Which blocklists are most important to senders?

    There are hundreds of blocklists available, but not all blocklists are created equal. Because any...

  • Composite Blocking List (CBL)

    Overview The Composite Blocking List (CBL) is a Domain Name System (DNS)-based blocklist. It incl...

  • SpamCop Blocking List (SCBL)

    Overview SpamCop is a spam reporting service that takes reports of spammers’ IPs addresses from r...

  • Weighted Private Block List (WPBL)

    Overview The Weighted Private Block List (WPBL) lists IP addresses that connect to WPBL members' ...

  • What is Spamhaus?

    Spamhaus is an international blocklisting organization that was founded in Europe in 1998 to trac...

  • Spamhaus Block List (SBL)

    Overview The Spamhaus Block List (SBL) is a list of IPs of spam sources, including known spammers...

  • Spamhaus Policy Block List (PBL)

    Overview The Spamhaus Policy Block List (PBL) is a list of all dynamic IP addresses and some stat...

  • Spamhaus Composite Snowshoe (CSS) blocklist

    Overview The Spamhaus Composite Snowshoe (CSS) blocklist uses proprietary data to identify IPs wi...

  • Spamhaus Exploits Block List (XBL)

    Overview The Spamhaus Exploits Block List (XBL) is a list of known open proxies and illegal third...

  • 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...

  • LashBack's Unsubscribe Blacklist (UBL)

    Overview LashBack's UBL includes the IP addresses of senders who send to email addresses harveste...

  • Invaluement blocklist

    The Invaluement blocklist is made up of three commercial anti-spam blocklists. ivmURI: This list...

  • 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 ...

  • 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-...

  • 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...

  • 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...

  • 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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