What is the CBL?
The CBL takes its source data from very large spamtraps/mail infrastructures, and only lists IPs exhibiting characteristics which are specific to open proxies of various sorts (HTTP, socks, AnalogX, wingate etc) and dedicated Spam BOTs which have been abused to send spam, worms/viruses that do their own direct mail transmission, or some types of trojan-horse or "stealth" spamware, dictionary mail harvesters etc.
NEW! The CBL also lists certain portions of SpamBot infrastructure, such as Spam BOT/virus infector download web sites, and other web sites or name servers exclusively dedicated to the use of Spam BOTs. Considerable care is taken to avoid listing IP addresses that have are or are likely to be shared with legitimate use, except in the case of infector download websites.
In other words, the CBL only lists IPs that have attempted email connections to one of our servers in such a way as to indicate that the sending IP is infected, OR, IPs specifically dedicated to the propagation/use of Spam BOTs.
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WORKING TO PROTECT INTERNET NETWORKS WORLDWIDE
Spamhaus tracks the Internet's Spammers, Spam Gangs and Spam Services, provides dependable realtime anti-spam protection for Internet networks, and works with Law Enforcement to identify and pursue spammers worldwide.
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http://njabl.org/
NJABL.ORG is Not Just Another Bogus List. This effort began out of frustration with the amount of spam coming into our networks and with the lack of options for an existing dnsbl with policies and stability we could live with. NJABL.ORG maintains a list of known and potential spam sources (open relays, open proxies, open form to mail HTTP gateways, dynamic IP pools, and direct spammers) for the purpose of being able to tag or refuse email and prevent at least some spam. We do not block email. We just provide a tool for network/system/mail administrators to use to protect their mail servers from email abuse. Our goal is to provide a stable and effective dnsbl with clearly stated and strictly adhered to criteria for listing.
Why are you blocking my email?
We're not.
If you're trying to send email to somebody and your message was returned with an error message referencing this site, your intended recipient's mail server most likely rejected the message based on your mail server's or your computer's IP address being in the list we maintain. This is most likely due to your mail server being misconfigured as an open relay or your computer's IP address being listed as a dynamic/dial-up IP. In most cases, this means your Internet Service Provider needs to be informed, as they will need to secure their mail server and have it removed from the list or make provisions to accept mail from your computer even though your IP is in our list. If you or your organization run your own mail server, you'll have to inform whoever maintains your mail server so they can fix it and remove it from the list.
If you're having trouble receiving email from people who used to be able to send you email, it's possible your ISP or whoever runs the mail server your mail is delivered to is using our list or one or more of several dozen other anti-spam dnsbls. Without seeing the exact error message received by the person who tried to email you, it's impossible to say if the server they send their email through is in our list or any other list. In this case, your best bet is to contact the ISP who's mail server appears to be listed and notify them of the problem. They will have to deal with whatever problem caused their system to be listed, find out which lists they're in, and do what they can to get off of them.
Again, we do not block email. Mail server administrators may use the information we maintain to either tag or reject email on their servers. This is a policy decision they have made. If you object to the idea of your mail being rejected just because it goes through an open relay or other type of spam source, contact your Internet Service Provider or those who maintain the system that rejected your email. We cannot change their policy.
Do not send us email complaining about this. We cannot help you. Only the people who maintain the misconfigured mail server can fix the problem. In most cases, this means you should forward the error message to your service provider or your organization's IT staff. That way they can contact us if necessary, fix their mail server, and remove their mail server's IP from the list.
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