Spam Blacklist Checker

Spam Blacklist Checker is a useful software tool that allows users to check if an IP address is flagged in a spam blacklist (dnsbl.sorbs.net). The program was developed to solve the issue of dynamic IPs being allocated to users through DHCP, which often end up being flagged in a spam blacklist. This can cause any outgoing mail to be flagged as spam, which is frustrating for users as they are not always aware of outgoing mail failing to arrive due to it being black-holed.

To address this issue, the Spam Blacklist Checker was created. It checks the DNS to see if the IP address assigned to the user is blacklisted or not. To use the tool, users need to install the module Stuff::SpamBL manually. Once installed, users can download and run the program file as it is.

Using the program is straightforward. Users can input a list of IP addresses and domain names from the command line or through standard input. The program outputs two columns, with the first column display the IP address and the second column displaying the blacklist flags.

For example, the program may output result similar to this:
81.156.32.127 DSN-BL:DYNAMIC
81.156.32.128 DSN-BL:DYNAMIC
81.156.32.129 DSN-BL:DYNAMIC:EXPLOITED
81.156.32.130 DSN-BL:DYNAMIC:EXPLOITED
81.156.32.131 DSN-BL:DYNAMIC

In this case, all the listed IP addresses are flagged as dynamic IPs. However, the IPs 81.156.32.129 and 81.156.32.130 are also flagged as EXPLOITED. This means that these IPs will have a high spam score in Spam Assassin, which can be detrimental to IP owners.

Overall, Spam Blacklist Checker is a reliable and useful tool for those who are concerned about their IP addresses being flagged in spam blacklists. While the installation process may be a bit cumbersome, the program itself is simple to use and provides accurate results.