Can anyone recommend a rule format that will block partial CIDR blocks located on irregular IP address boundaries rather than having to list a unique rule for each class C address space within that CIDR block?
Also, we block class C address space using the following rule format:
H~iii\.jjj\.kkk\.:NUL
were iii, jjj, and kkk range from 0 to 255. Is there a another/better way to do this?
The best way is probably to use the IMail SMTP "Control Access" file, which lets you block on CIDR ranges (using netmasks, though -- you can use the CIDR tool at http://www.DNSstuff.com to convert CIDR ranges and netmasks). That way, the E-mail never even reaches your server (reducing bandwidth), and it is 100% accurate (the header filtering isn't).
Also, if you have Declude JunkMail, you can use CIDR ranges in IP blacklists (such as 192.0.2.128/23).
-Scott
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