Weird. At least on Mail.app and Mavericks, plugins need to be properly code signed, etc.
(I had to do that for https://github.com/rcarmo/HJKLPlugin to work in Mavericks)
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Yes, OP mentioned that it was fixed in Mavericks. Since Mavericks is free, I don't really see the problem. If you are running a < 2007 Mac you really don't care about security anyway.