Spammers were flooding my users and traditional filters such as SpamAsssassin were ineffective. I tried traditional DNS-baed blocklists, but since we go through our hosting service's DNS servers, we were blocked by the best services due to volume. I was skeptical about MagicSpam but, once I tweaked ...

I want to echo the request to block a range of IPs, ideally using the CIDR syntax. I have a long list of IP ranges I've had to add to my firewall's deny list because the usable blocklists don't catch spam from these IPs. (the MIPSpace-Poor list does catch some of these, but also blocks too many legi...