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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From clicking on phishing emails to visiting malware dropper sites, our threat intelligence provides automatic protection for your users.
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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.
Spamhaus Intelligence API
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.
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.
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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.
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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 Alice Cornell on 13 May 2022
As part of our Deliverability 101 series, we're inviting experts from across the industry to share their email sending wisdom, starting with the highly respected Alice Cornell. Alice is the Director of Email Deliverability at Change.org, and she's sharing her experiences, explaining how change.org achieved consistent inbox placement once they got the basics nailed!
The art of deliverability is all about reaching your customer/user inbox by only sending email to people who want it, when they want to receive it and only sending email they want. In theory, this is a neat definition, but it can be a lot more complicated in practice.
Change.org is a great example of how challenging that little sentence can be to implement. With nearly half a billion users spanning all 196 countries and as an open platform whose mission is to empower everyone everywhere to make the change they want to see, making sure we reach the right people with the right message at the right time is definitely an art as well as a science.
When I started at Change.org nearly nine years ago, our email program was a very different animal. As I began to get to know its lists and metrics and tackle immediate deliverability issues, I couldn’t understand why some of our metrics seemed out of kilter when we were sharing campaigns with folks that clearly cared about them and were keen to take action.
Through detective work (and believe me, deliverability skills involve a lot of detective work), I discovered that when people tried to unsubscribe, we sent them to a broken landing page. Because there was no way to confirm that Change.org had unsubscribed them, users began marking the email as spam in an effort to be removed from our list. Simply fixing the unsubscription landing page reduced user complaints and increased successful inbox placement.
This is a perfect illustration of what it looks like to “get the basics right”. Unsubscribes do not damage deliverability. In fact, a higher than usual unsubscribe rate can be a useful indicator that there is something you, as a sender, need to be doing better.
Most email professionals know what basic deliverability best practices for avoiding the spam folder are (if you’re unsure, you can read this excellent Spamhaus blog). Still, they also know it is not always as easy as it might seem to actually implement them.
A struggle that we often come up against is persuading other parts of the organisation about how important data quality is. Good data is the cornerstone of any email program, but it’s easy for people to assume more is better. Actually, keeping your data clean and current is essential for good deliverability.
The company had to move quickly to make some impactful changes. This meant being clear on what these changes would mean for the business.
What helped with the escalation internally was
Change.org has come a long way from those early days of high inbox user complaints. The company has really tightened up data hygiene as a critical element of improving our sender reputation.
We now have many different layers of security to prevent bad actors from impersonating users while continuing to wage the constant battle as spammers persist in trying to find new ways of abusing organizations across the world.
For Change.org, agile campaigning is essential as our users respond to real world events. The war in Ukraine has had our team rapidly mobilizing to support the massive numbers of people coming to the site. This can lead to unpredictable send volumes – a red flag for many mailbox providers.
Back in the first week of the conflict, our UK team also received the fantastic news that Nazanin Zaghari-Ratcliffe was due to be released from prison in Iran. We knew that her supporters would want to hear this right away and our already increased email volume was suddenly about to be doubled that week. However, deliverability remained steady due to the strong trust we have built with mailbox providers by implementing solid best practices.
No matter what your brand’s business, a stable sender reputation is essential if mailbox providers are to trust your engagement programs and deliver the inbox experience your customers or users deserve by focusing on the basics:
Those senders will be well-positioned to win the never-ending fight against email abuse and spammers. It’s the only way to keep brand communications out of the spam folder and into the users’ inboxes who want to hear from the brands they love the most.
15 February 2022
There is no shortcut to successful email deliverability. This series offers guidance to marketing and deliverability teams providing best practices to ensure email deliverability.
Whether it’s personal, business, or email, reputation must be earned. Here's a look at why reputation matters when it comes to email and what you need to be doing to improve it.
Here’s a quick review of the legalities involved with collecting Personally Identifiable Information (PII).