Have you been blocked?
All blocklists are researched and managed by The Spamhaus Project.
Simply click on the link below, which will take you to the Project’s IP and Domain Reputation Checker. From here you will be able to enter your IP or Domain and begin your request for removal.
Please note that the Project’s IP and Domain Reputation Checker is the only place where removals are handled.
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The Blocklist Tester
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The Reputation Portal
A tool for ASN owners to get visibility of their IPs’ reputation and proactively manage listings.
Help for the Project's legacy DNSBLs users
Using the Project’s legacy blocklists and suddenly experiencing email issues? This page may be able to help.
In depth information about the technical details and implementation of our products.
Posted by Sarah Miller on 1 Apr 2022
With the latest Virus Bulletin (VB) results*, it's evident that there is a marked difference between the two blocklist services associated with the name "Spamhaus". With one scoring a final catch rate of 99.54% and the other 72.22%, we wanted to clarify the differences in these services. This way, you can ensure you're getting the most from Spamhaus data.
The history – Researchers within the Spamhaus Project have been at the heart of IP reputation (and, latterly, domain reputation) since 1998. The wider internet community was part of the Project’s inception, i.e. like-minded individuals joined its Founder, Steve Linford, in observing, listing and sharing malicious IP addresses to help protect those using the internet. Naturally, it was an obvious choice for the Project to share its blocklists with non-commercial organizations for free.
The Project’s free DNSBLs were (and still are) shared globally via Public Mirrors, which at the time were generously donated by sponsors and partners of the organization. Email administrators must manually set up their email infrastructure to query these blocklists via a DNS zone, e.g. zen.spamhaus.org.
In-house, this service was (and is) referred to as the “Public Mirrors“. However, if you’re using these DNSBLs, you’ll likely think of them simply as “Spamhaus’ DNSBLs”.
This service still exists, and billions of queries are made to the Project’s Public Mirrors every day. This is the service that is listed as follows in the VB report:
BUT, many users are unaware that this is a legacy service. There is a superior service available, with access to additional blocklists to increase catch rates, real time listings, increased flexibility and improved performance (and it’s still free to non-commercial entities).
The history – Spamhaus Technology developed a service called the Data Query Service (DQS) for commercial entities, taking the Project’s data and making it accessible in a way that met the demands of commercial use. As this service evolved, they started to offer the DQS to non-commercial users for free on behalf of the Project, so its “Public Mirror” users could also benefit from the improved service.
The differences – See below for a quick reference to understand how each of the services compares.
We recognize that IT teams have increasing pressures placed on them, and as a result, they don’t always have the luxury of being able to specialize in one area. To maximize the benefits users can get from the DQS, our engineers have created plug-ins for the two most popular open-source email filters; SpamAssassin & Rspamd. These free plug-ins provide configuration to immediately optimize our IP and reputation data to ensure users get the highest catch rates. It is this set-up that is used for the VB test below:
For those wondering what the primary reasons for the noticeable difference between the two scores are, here’s our engineers’ explanation:
If you’re using the legacy blocklists from the Spamhaus Project, we strongly urge you to move across to the DQS. Reconfiguration takes minutes, and you will be able to download a personalized manual via our Customer Portal once you sign up for the service.
*Correct at time of publication.
Spamhaus’ Data Query Service (DQS) is an affordable and effective solution to protect your email infrastructure and users.
Using your existing email protection solution, you will be able to block spam and other related threats including malware, ransomware, and phishing emails.
The service has never failed and utilizes the longest established DNSBLs in the industry.
8 November 2023
Discover how Censornet AI security platform integrates Spamhaus’ real time blocklists with two-way sharing of basic email connection data, to provide 'exceptional' email protection for its users.
17 May 2023
Are you currently using the Spamhaus Project’s DNS Blocklists (DNSBLs) via OVHCloud? If you've answered "yes" to both of these questions, you need to make some changes to your email infrastructure.
22 September 2022
Are you currently using the Spamhaus Project’s DNS Blocklists (DNSBLs) and use Amazon Web Services' DNS? If you've answered "yes" to both of these questions, you need to make some changes to your email infrastructure.