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Use of the DNSbl ip4r
Service
If you have a mail server that can use DNSbl lists (sometimes known as RBL lists, or DNS Blacklists), you can take advantage of our ip4r based lookup system. While we do include some examples of how to use our service with popular mail servers below, you may have to contact the vendor of your mail server application for setup assistance if you run into problems. DNSbl zone name: dnsbl.ahbl.org Format of queries: Take IP address wishing to be checked, reverse the octets (1.2.3.4 becomes 4.3.2.1) and prepended to the zone above. Example query: 2.0.0.127.dnsbl.ahbl.org Cost: Free to all Please contact us before using by e-mailing admins@2mbit.com. If you are a large provider with many customers, or are planning to do more then 100,000 queries per day, you must contact us to confirm that this is ok. We may require you to setup your own AHBL mirror server locally to reduce the load on our systems. For providers who use our DNSbl service, you must make sure to alert your customers to the fact that you are using our service on the support pages or signup pages with a link to our website. Your customers have a right to know what methods you are using to filter their e-mail. Disclaimer: We can not, and will not be held responsible for any lost e-mail due to you using our list. By using our list, you explicitly agree to accept full responsibility for any actions that result due to the usage of our list. If your mail server has the ability to block based on certain response codes, the list below should help you decide which reasons are best for you to block on. 127.0.0.2 - Open Relay 127.0.0.3 - Open Proxy 127.0.0.4 - Spam Source 127.0.0.5 - Provisional Spam Source Listing block (will be removed if spam stops) 127.0.0.6 - Formmail Spam 127.0.0.7 - Spam Supporter 127.0.0.8 - Spam Supporter (indirect) 127.0.0.9 - End User (non mail system) 127.0.0.10 - Shoot On Sight 127.0.0.11 - Non-RFC Compliant (missing postmaster or abuse) 127.0.0.12 - Does not properly handle 5xx errors 127.0.0.13 - Other Non-RFC Compliant 127.0.0.14 - Compromised System - DDoS 127.0.0.15 - Compromised System - Relay 127.0.0.16 - Compromised System - Autorooter/Scanner 127.0.0.17 - Compromised System - Worm or mass mailing virus 127.0.0.18 - Compromised System - Other virus 127.0.0.19 - Open Proxy 127.0.0.20 - Blog/Wiki/Comment Spammer 127.0.0.127 - Other For an even more detailed overview of the various codes above, see here. If you need some help in setting up some of the more common SMTP servers, here is some basic documentation that might help you. SpamAssassin EXIM 4 SpamPal Postfix 2.x IPSwitch IMail 8.1 Sendmail 8.12.x |
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