This was sad to read: > Botnets appeared as a way to get around RBLs, and in response spam fighters mapped out the internet to create a "policy block list" - r

This was sad to read: > Botnets appeared as a way to get around RBLs, and in response spam fighters mapped out the internet to create a "policy block list" - ranges of IPs that were assigned to residential connections and thus should not be sending any email at all. Your residential connection might not, but mine does.