I am running a BIND installation as a simple RBL server. The problem I am running in to is that if I have listed a block of IP addresses like:
*.0.0.10.rbl.mydomain.net. IN A 127.0.0.1
*.0.0.10.rbl.mydomain.net. IN TXT "Excessive Spam"
This meets all the requirements so that mail servers will reject the entire class C block.
The problem comes in if I need to delist one IP address in the middle of the block, such as 10.0.0.100 for this example.
Is there a way I can do this without having to write 252 discrete host listings and skipping this one address? I have tried adding a legitimate IP as the rDNS address but mail servers still count that as listed.
Much appreciation for your help and advice.