Protection against SPAM
Black and white lists

Last Updated: 12.07.2024 20:18 CEST
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Top 10 DNS Blacklists


  • May 24,2023: Apache SpamAssassin DNSBL update on our systems
  • December 17, 2022: Apache SpamAssassin 4.0.0 has been released! This is a major upgrade to SpamAssassin.
  • January 18, 2022: Spamhaus free DNSBLs and use a Cloudflare DNS resolver to make those queries. Made recommended changes as Spamhaus Tech's article on moving to free Data Query Service.
  • March 5, 2021: The blackSMTP DNSBL recommendations has been updated.
  • October 30, 2019: The domain for EMAILBASURA.ORG lapsed and is now blacklisting the entire internet.
  • July 5, 2019: The blackSMTP DNSBL recommendations has been updated.
  • October 8, 2018: Removed as the service is out of operation.
  • July 17, 2017: Removed IX HASH SEM as this zone is out of operation.
  • May 8, 2016: SURBL ABUSE was added and therein merged individual lists were removed.
  • March 29, 2016: Removed IX HASH GENERIC and IX HASH HOSTEUROPE, as these zones are no longer updated.
  • September 14, 2015: All subzones have been shut down and only the SURBL: Combined SURBL list may be used. Disable all other blacklists.
  • September 7, 2015 : DNSBL definitions and recommendations received a major update.
  • March 31, 2014: The Abusive Host Blocking List(AHBL) DNS Blacklist is shutting down. We remove this DNSBL from our configuration.
  • March 1, 2013: The Not Just Another Bogus List(NJABL Combined List) DNS Blacklist is shutting down. We remove this DNSBL from our configuration.

A DNSBL (Domain Name System Blackhole List, Domain Name System Blacklist, RBL, Real-time Blackhole list) is a hosted list that uses DNS as the mechanism for a database lookup to a reputation provider (the host of the DNSBL, either as a blocklist or allow list), such as blackSMTP, to determine the trustworthiness of an IP, domain name, and hashed value (like a URL or file).

DNSBL functions and operations are defined by RFC5782.

Top 10 Spam Countries

Top 10 SPAM Categories

Top 10 Spam ISPs

Top 10 Spam Types

Phishing and spoofing email spam statistics

  • Nearly 96% of phishing attacks are conducted using email.

  • 78% of organizations faced business email compromise (BEC) attacks in 2022. BEC includes attacks like payroll redirect and supplier invoicing frauds.

  • The average cost of BEC exploits was $5.98 million in 2022.

  • 82% of organizations faced successful email-based phishing attacks in 2022.

  • 38% of individuals have said they received at least one suspicious email attachment.

  • 16% of individuals said they received an email impersonating their organization.