This is a quick article I wrote for a client in my consulting role at ISA. It was published on their website for clients to read and comment on. It was relevant at the time (Sep 2003), but today the information is quite dated and no longer relevant at all. My experience with ISPs and the ongoing spam problem, the advances made in spam delivery by the spammers, and the RBL list technology basically staying the same and not changing, has caused them to be useless. I am adding it here, just to record it for reference.
