E-Mail::Spam::RBL's Bad ?

There is a long article at discussing alternatives to using Real Time Black List's (RBL's) to block delivery of messages from mail servers known to allow open relay.
I haven't read the entire thing, but I think--so far--I disagree with most of it.
I don't use RBL's for some of these reasons, but I respect them in principle and certainly wouldn't attack the ideas or their implementations as being unconstitutional, censorship, or discriminatory. A lot of those points seem to really be stretching it.
Let me know what you think

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