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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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 The Spamhaus Team on 22 Sep 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 Amazon Web Services' (AWS) 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 soon, 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.
AWS 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 AWS’ IP space, commencing from Tuesday, Oct 18th, 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.
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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.
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.