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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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.
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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.
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Immediately block connections to dangerous sites, including phishing and malware dropper websites. A ‘set and forget’ solution.
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Threat intelligence data in API format to enable users to easily integrate metadata relating to threats with their own applications, programs, and products.
A wide range of datasets, providing multiple layers of protection. They can be plugged directly into your existing hardware, making them an affordable choice.
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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.
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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.
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The Blocklist Tester
A tool to help you check if your servers are correctly configured to use Spamhaus DNSBLs.
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 17 Jan 2022
Are you currently using the Spamhaus Project's DNS Blocklists (DNSBLs)? Do you access them via the Public Mirrors, for example, query "sbl.spamhaus.org"? Do you use Cloudflare's DNS? If you've answered "yes" to all three of those questions, you need to make some changes to your email infrastructure. These changes are quick and easy to make, but if you fail to make them, you could find that at some point in 2022, all or none of your email is blocked!
To provide a clear signal to these users that these blocklists are not protecting their email, Spamhaus will return an error code; 127.255.255.254. If you haven’t set up your email servers to accept this error code, all emails could be rejected and bounced back to their sender.
To prevent any issues with your email stream, stop accessing Spamhaus’ free blocklists via the Public Mirrors and start accessing the blocklists via our free Data Query Service (DQS), which you can sign up for here.
Once you’ve verified your email address, you will get access to a “DQS key” to include in your configuration. These config changes take only minutes; see our technical docs for more detail.
Cloudflare masks organizations’ queries to the Project’s Public Mirrors, so the team can’t attribute usage to individual entities. They have no way of establishing the number of queries a single organization is making.
To provide transparency, these free blocklists can be accessed via the free DQS.
If your MTA can’t correctly parse these error codes, serious issues can occur, including bouncing all emails back to their senders and your emails not being queried against the blocklists. Here’s how to properly configure your MTA to process these error codes, if you continue to use the Spamhaus Project’s DNSBLs.
This year, the Spamhaus Project will slowly implement the error code across Cloudflare IP space, commencing from Tuesday, February 15th, 2022.
Please don’t delay – take action now and move to the free DQS.
Additional information for Spamhaus Project’s DNSBLs users having issues due to error codes is detailed here.
Previous communications that were sent in relation to these changes can be found here:
Not a problem – reach out to us via Twitter @spamhaustech or our contact form, and we’ll try and answer any question you have or failing that we’ll pass it onto the Spamhaus Project for a response.
If you are using the Spamhaus Project’s Public Mirrors and are suddenly experiencing issues with your email stream, it is likely that you are having issues parsing newly introduced error codes.
We have collated all the information you need to help you understand what you need to do to fix the problem and find out why these error codes have been introduced.
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.
1 April 2022
If you've been using Spamhaus Project's free DNSBLs you need to be aware this is a legacy service. With an easy config change you could be getting more value from the Spamhaus data.
17 November 2021
Users of the Spamhaus Domain Blocklist will soon have the added accuracy of hostnames being used for the abused-legit section. Get further information and also find out how you can get your hands on the beta version.
4 July 2018
If you're using the Spamhaus free public mirrors and Google's public DNS then it's likely your spam isn't being blocked. Here's what you need to do.