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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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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Spamhaus Intelligence API
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abuse.ch Real Time Feeds - coming soon
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View the geolocation, hosting network, malware names associated with each detection, and other critical data points.
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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.
abuse.ch Threat Intelligence Feeds – coming soon
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The Blocklist Tester
A tool to help you check if your servers are correctly configured to use Spamhaus DNSBLs.
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 The Spamhaus Team on 15 Feb 2022
Some ISPs offer more in-depth data about what happens to email once they have accepted it. Here’s a selection:
A “feedback loop” (FBL) allows Internet Service Providers (ISPs) to report spam complaints submitted by their users to the originating network. This is done using Abuse Reporting Format (ARF), a machine-readable format that redacts personally identifiable information. Some major ISPs offer a feedback loop as a free service.
You should process these reports promptly and immediately remove the complainants upon receipt. The length of time allowed for suppression to occur varies by law and country, so ‘immediately’ is the best practice.
The number of complaints generated by a given IP is given significant weight by receivers, though ISPs will not reveal the threshold as it is part of their spam filtering recipe and will vary from ISP to ISP. A good reputation allows slightly more forgiveness than a poor one. That being the case, keeping complaints as low as possible is the prudent thing to do.
If you sign up recipients via confirmed opt-in, keep your mailing lists clean, and only send relevant content to engaged contacts, you should have minimal complaints to manage. But, if you do receive them, we urge you to deal with them rapidly. Next in our guide is a detailed look at spamtraps.
15 February 2022
There are various methods used to build mailing lists & contact databases. Choose wisely - the quality of your contacts directly affects deliverability.
Here are the right and wrong ways to acquire marketing contacts. Ensure your address acquisition choices don't negatively impact your reputation.
Here's our guide to email frequency & engagement, helping you understand how often to email contacts and keep them engaged for email deliverability.