> Who invented spam filtering as we know it? Not to be facetious but who invented them, depends on your definition of "spam filter". I know you mean email filt

> Who invented spam filtering as we know it? Not to be facetious but who invented them, depends on your definition of "spam filter". I know you mean email filter, but when you put it that way, it makes me think of the generalized problem of filtering. Put that way, I don't think a who invented it. It was more like it was discovered by a what.