Note that not everyone is going to agree with my classification of false positives, and that's fine. In my determination, a false positive is a piece of mail that I signed up for that would've been blocked by a given blacklist. I think that's accurate. You will find, though, that some blacklists list things that I would not consider spam. For example, some lists will block mail from any sender who is not 100% confirmed opt-in (aka double opt-in). Since very few senders are fully 100% confirmed opt-in, lists such as these inherently block mail from many senders. A list operated in this fashion would have a vastly different interpretation of what constitutes a false positive than I would. It would be within their charter to list and facilitate the blocking of mail from sites like this, even if they haven't sent spam. This wouldn't be considered a false positive by such a list, but would potentially be considered a false positive by me.
Click here for information on what and how I determine to be spam and not spam.
