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 Blocklist Removal Center. From here you will be able to enter your IP or Domain and begin your request for removal.
Please note that the Project’s Blocklist Removal Center is the only place where removals are handled.
IT and security teams consistently face multiple business challenges. Discover how our solutions can help overcome some of those issues.
From processing issues, to email-borne threats our blocklists easily integrate with your current email set-up to improve anti-spam & anti-virus email filtering.
Employ our threat intelligence to increase visibility across security events, reveal potential weaknesses in your network, and threats to your brand.
Stay on top of the latest threats and proactively combat botnet infections, and other forms of abuse, with our solutions.
From clicking on phishing emails to visiting malware dropper sites, our threat intelligence provides automatic protection for your users.
Our products provide additional layers of security for networks and email. They also present security teams with additional insight into malicious behavior.
Border Gateway Protocol (BGP)
Block the worst of the worst at your network edge, taking advantage of your existing BGP-capable routers. Configuration only takes minutes.
Data Query Service (DQS)
Benefit from industry-leading real time blocklists. These DNSBLs easily plug into your existing email infrastructure to block spam and other email threats.
A powerful research tool to investigate relationships between internet infrastructures. Quickly pivot to new areas of concern to rapidly investigate potential threats.
Immediately block connections to dangerous sites, including phishing and malware dropper websites. A ‘set and forget’ solution.
A wide range of datasets, providing multiple layers of protection. They can be plugged directly into your existing hardware, making them an affordable choice.
Border Gateway Protocol (BGP) Feeds
Do Not Route Or Peer (DROP) and Botnet Controller List (BCL) datafeeds can peer with your existing BGP-capable router.
Domain (DBL), Zero Reputation (ZRD) and Hash blocklists (HBL) enable you to block content in emails, filtering out a higher rate of email-borne threats.
Data for Investigation
Passive DNS and extended datasets give you additional information on internet resources. They provide deeper insights into incidents and possible threats.
DNS Firewall Threat Feeds
A wide range of feeds to apply to your DNS recursive server. Choose the right level of protection for your organization.
Spam (SBL), Policy (PBL), Exploits (XBL) and Auth (AuthBL) blocklists allow you to filter email from IPs associated with spam, botnets, and other threats.
Find out more about us.
Learn more about Spamhaus; who we are, and what we do.
Find out who we work with and how you can become a Spamhaus Partner.
Discover a wide range of blog posts, case studies and reports.
Commonly asked questions about Spamhaus products and processes.
In depth information about the technical details and implementation of our products.
Posted by The Spamhaus Team on 6 Oct 2020
Spamhaus’ Data Query Service (DQS) enables email provider, Universo Online (UOL) to protect millions of users from spam and other malicious email threats. Only taking minutes to implement, DQS has taken the “legwork” out of email filtering, freeing-up 20% of the team’s time resources, alongside reducing infrastructure costs.
UOL is the largest email provider in Latin America*, with 5 million users on its platform. Beyond email, the UOL Group is the largest Brazilian provider of content, technology, online payment methods and services.
UOL used a well-known, established practice to protect their users from being compromised by emails distributed by bad actors. To block spam and other email-borne threats, the team queried IP and domain validity via DNS, with local lists synchronized through Rsync. It delivered for a long time and kept users safe.
The challenge was relying on updates via Rsync, which requires time to batch process, and has occasional synchronization delays. While processing takes place, there’s no protection from newly listed threats. A risky strategy as cybercriminals become increasingly sophisticated and quick to exploit vulnerabilities. UOL, with long-established credibility, were keen to update their approach before any issues arose.
Solutions based on Rsync do not update in real-time and consume many resources. Not only was infrastructure investment costly, but it was also time-intensive from a maintenance perspective. Additionally, with so much to process locally, there were occasionally latency issues which affected their customers’ experience.
UOL had been consuming Spamhaus’s data since 2008. In updating from Rsync to a real-time solution, it saw an opportunity to reaffirm this data was still best-in-class. UOL began extensively testing and analyzing comparable network threat blocklists.
Competitors’ solutions were restrictive, with less effective catch rates. Spamhaus’ DQS comprises of several IP, domain and hash blocklists, with catch rates over 99% and false-positives under 0.02%.
Being a real-time solution, as soon as a threat is identified, it’s pushed to the 80+ Spamhaus servers across the globe, ensuring UOL is protected immediately. Furthermore, with the intelligent routing of queries based on geolocation, latency isn’t an issue, positively impacting customer experience.
DQS rejects spam and other email threats at smtp.connect. This means there’s less data to process and store within UOL’s infrastructure, eliminating the need for two servers running concurrently.
Rejecting spam at this level also limits the exposure of users coming into contact with, and being compromised by, bad actors. With all this competitive advantage, UOL selected Spamhaus DQS as their preferred solution.
The product simply plugged into UOL’s existing infrastructure and was implemented by a single team member within 15 minutes. Once live, results were instantly reported on UOL’s internal logs, and no further work was required, making DQS a ‘set and forget’ solution, updating automatically.
The solution has helped UOL maintain its world-class email security while reducing its high infrastructure investment and its reliance on resources to manage its solution. In the words of Alcides Zanarotti Junior, UOL’s Director of Technology, “The best bit? We get all this benefit for a great price. Spamhaus has provided us with multiple benefits.”
Having now been live for a year, Alcides Zanarotti Junior, confirmed, “DQS is so fast – it’s amazing.” he explained, “We are instantly protected, and our users are so pleased with the service we’re providing.”
To sign up for a free 30 day Data Query Service trial, click here.
* beyond Google, AOL, Microsoft, and Yahoo
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.
29 September 2020
Spamhaus produces many different DNSBLs (blocklists). The question is which ones to apply where? This simple guide provides you with all the information you need.
Grasp the specifics relating to email source code, so you can apply IP and domain threat intelligence to the right place in your email filtering process.
25 March 2019
Spamhaus’ blocklists, used with specially configured SpamAssassin, stop over 99% of spam email. It's an effective combination that won't break the bank.