Although a bit off topic to your question directed at the developer audience I'm curious to learn why you feel the spam filter with the accompanying spam quarantine is not a good enough tool already?
Too many false positives or too low hit rate for spam messages?
Is your problem more with spam PM or public spam topics/replies/comments?
The spam filter does a good job at identifying obvious spam - posts with dodgy links, somewhat random text with specific keywords among others. Where the spam filter fails though is that it sometimes takes legitimate posts and marks them as spam. When inspecting those posts, there doesn't seem to be anything obvious as to why it was marked as spam. We thought that the spam filter would eventually learn but this doesn't seem to be the case and we may get a few posts every week that we need to release back into the threads.
One of our main concerns is the Private Message spam. There is currently no way to delete the spammers PMs from a users inbox without logging in to the targetted user and deleting it ourselves. There really needs to be a function to recall and mark all private messages from a user to be removed from the inbox of the targeted users. We have had multiple instances where a user had sent a large amount of messages out to a lot of users and our report board got flooded with spam reports because of this. For normal posts, this isn't a problem as you mark all content by that user as spam and thats it. Private messages remain in the inboxes of the users and we have to just tell people to delete the message manually. I raised this as an idea here.
