Wouldn't a difference in the number of recipients in the ALLRECIPS and REALRECIPS variables be a rather good spam indicator, as this means that the recipient list is a mixture of both valid and invalid addresses? I guess that such a test could be implemented directly in Declude, but it has to be carefully used as it will have some false positives. It could be used more securely if the test also had a configurable threshold setting for the minimum number of differences, as I have noticed that some spam have a recipient list that contains many invalid addresses together with a few valid ones.
This is something that we are considering adding.
-Scott
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