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With Greylist Weight Threshold set to zero (0) we expect any IP that has a negative score to skip greylisting. But they don't seem to. Like many others, We use DNS whitelist(s) to apply negative scores for weighting. Unfortunately it appears that all negative scores are converted to zero for greylist weighting. This means when greylist threshold is set to zero that an incoming email that is weighted as negative 60(-60), which is a great reputation, is still greylisted. You might think setting greylist to 1 is a way to resolve this issue but it just allows anyone to bypass greylisting if they are not on a blacklist yet and they have SPF and reverse DNS set up.
Has anyone else noticed this or have I got it all wrong?