Comment 8 for bug 357340

Its not really a duplicate. This bug proposes filtering, the other bug proposes a reply-based unsubscribe mechanism. As William (above) mentions, these are really two different issues - one is to prevent e-mail with useless comments (particularly those requesting unsubscription) from bothering legitimate users, and one is actually to provide a mechanism such that unsubscription can be processed by e-mail. Also, as William notes, this is something that could be potentially dangerous (exposing changes in preferences/subscription settings to unauthenticated input), and should involve more planning that simply filtering readily identifiable spam.