Today I submitted a patch for rblcheck, a program that queries multiple DNS-based spam blacklists. For a long time I've used a modified version of rblcheck-1.4 that would take a DNS hostname instead of just an IP address, but tonight I made the same changes into rblcheck-1.5 and submitted the patch.

Though the blacklists are of source based only on IP address, when doing random checks it's much easier to use the hostname instead. My patch is smart enough to know when a given hostname has no or more than one IP address associated and respond accordingly. I've used this functionality for more than a year.

The patch is found here as rblcheck.patch.