Whitelists do not necessarily imply challenge-response filtering

I often see people say something like "I don't like whitelisting" and then go on to rant about the problems with challenge-response filtering. Using a challenge-response system almost always implies the use of a whitelist but the converse is not true! For example, as I describe on the Reverse Spam Filtering page, I use a whitelist (*) but I do not use challenge-response filters.



(*) But I call it a greenlist.
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