If I'm interpreting your question/post correctly....
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I think the "best-practise" comment came from an earlier recommendation for "conservative" settings for RBLList. These settings were seen as non agressive, whereas the default settings that were in sme 7.0 (I think it was 7.0) when it was released, were more agressive and perhaps would block mail that some people wanted to receive.
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Perhaps the words "best-practise recommended" should be replaced with "conservative non agressive".