Freshmeat page: http://freshmeat.net/projects/rblcheck/
rblcheck is a lightweight C program for doing checks against DNS-based IP blacklists, such as the MAPS RBL, DUL, and RSS listings, or the ORBS list. It works well in conjunction with Procmail for filtering unwanted bulk email, but also functions as a command-line tool for performing quick lookups.
This project has the following developers:
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