Brad, what is your thought about this? Personally, I find it rather annoying. I'm sure we can trust that proper contributions are acknowledged; I don't think contributors should need to draw extra attention to them.
Or is there a serious reason to believe contributions won't get acked otherwise?
On an unrelated note, I have a question about Zilla. When someone marks a bug as a duplicate, I get two mails - one for the bug that was resolved as a duplicate, and one for the bug it was marked a duplicate of. So far, this is correct. However, shouldn't that latter mail contain only this information? Sometimes I see an address being added to the CC list within that e-mail, and I'm wondering how that is possible and whether that might be a bug.