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The "Sender is in address book" determination is a core Thunderbird  capability, not really a JunQuilla capability – JunQuilla just shows you that this is occurring.

But I maintain the core code as well as JunQuilla, so I am happy to answer questions about this.

But to do this, I really need to know why the "in AB" is being detected. You need to look at the source of the email that is acting badly, and look at the various named lines (headers) at the top of the email. There are actually a number of lines that might get interpreted as the "Sender" depending on the situation, including "From" (which is the most normal), "Reply-to", or even "Sender". Somewhere there must be an address that TB is finding that it also finds in an address book. Unfortunately there is not much that you can do to fix this if it fails, unless there is some very specific pattern that is giving you problems that could be detected (perhaps using FiltaQuilla which allows very precise search terms.)

But generally, I have found that automatic junk filtering (which for me is upstream Spam Assassin, along with the local TB bayes filter and whitelisting) is able to reject about 95% of junk email, with no false positives. The other 5% you just have to put up with, and manually mark them as junk. The cost of getting those last 5% is false positives, which to me are completely unacceptable.

rkent