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 blocklists updated in real-time. 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.
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Posted by Milly Fawcett on 29 Oct 2019
As IT budgets and resources are squeezed we understand you may have to shop around. Be it for hardware, software, or threat intelligence data, for that matter. But beware…not all email blocklists (DNSBLs) are equal.
Recently I was introduced to xkcd.com by a colleague – it’s simplicity and comedic value is genius, check-it out. Upon browsing through the archive, I happened upon this little gem:
This got me to thinking about a phrase my mother drilled into me as a child “Buy cheap, buy twice.” It turns out my mother was right (again), and despite knowing this, sometimes I still can’t resist a bargain. Recently I purchased a ‘reconditioned Apple BlueTooth keyboard’ at a fraction of the cost of a new one. However, over the past few months, I’ve watched the letters rapidly fade off the keys. It’s a good thing that I can touch type; otherwise, this article would have looked like ‘thod’ [sic].
But it’s not only cheap keyboards that are a false economy. If you’re currently reading this and considering a more ‘economical’ blocklist (DNSBL), make sure you’re comparing apples with apples; otherwise, you’ll soon have forgotten the ‘mark-down’ price, in light of the problems the poor quality of data, or service, is causing you.
Here are some questions you should be asking your blocklist provider to ensure you’re getting quality for less:
A simple way to check how trusted the provider’s data sets are is to ask how many mailboxes their current blocklists/DNSBLs are protecting. As a benchmark, Spamhaus currently protects 3 billion mailboxes every day, 365 days a year.
Find out the amount of email-borne threats that are blocked by the data sets you’re considering purchasing. Ensure an independent source verifies this figure; for example, Virus Bulletin.*
There’s no point in purchasing quality data if you’re going to have latency issues. Spamhaus has 80+ commercial mirrors distributed around the globe, ensuring our data is always available at low latency, no matter where in the world you are located.
False positives create issues for your customer/user base. The knock-on effect is an increase in the amount of inbound traffic your help desk has to deal with. Ultimately this creates additional ‘noise’ for your team and pushes up your resource costs.
Establish what the process is for remediating a false positive, as and when it does occur. Does the process comply with the Internet Research Task Force’s (IRTF) best current practices, as detailed here. Is the cost borne by the block list provider or you?
There are several ways data can be transferred from your provider to you. Ensure you will be receiving the updates in as near to real-time as possible.
Data sets should be based on a broad range of data from independent sources. These should include numerous sectors ranging from Internet Service Providers (ISPs) to Enterprise businesses, in addition to in-house spam traps and honey pots.
The threat landscape changes at an incredible speed, so one approach/system does not cut it. Your provider must have multiple engines backed up by a team of dedicated and experienced spam researchers. Techniques including machine learning, alongside heuristics and manual investigations should be utilized.
Remember; it’s quite easy to produce a blocklist. However, to do so for decades with consistently high catch rates and low false positives requires commitment, processes and people.
Some providers focus solely on supplying threat intelligence data. This data is plugged directly into your existing infrastructure, with no extra costs. However, others may require you to purchase additional hardware or software leading to capital expenditure.
Ask your potential provider how they can make the data you receive from them more relevant to the threats you are being subjected to.
* SpamAssassin and the Spamhaus Data Query Service (DQS) blocked 99+% email-borne threats in VB Tests.
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.
18 May 2020
It's a well-known fact that filtering emails using IP blocklists (DNSBLs) blocks the vast majority of malicious emails. It's effective and economical, using minimal computational power. So why should you also use domain and hash blocklists for filtering?
IP & Domain Blocklists (DNSBLs) are very effective at filtering malicious emails. However, they do have one big limitation: How do you block an email sent from a compromised account at Gmail, Hotmail or any other large email service provider (ESP)? Hash blocklists are the answer.
5 December 2018
If you are a current Rsync customer with under 50,000 users it's likely that you will find it beneficial to migrate to our Data Query Service.