There is a problem with the descendant notification plugin where it is sending out two emails. The problem has been reported to them, and I don't believe that its been resolved yet. Note that if you do experience this problem, you will find that even if you disable, but don't remove the plugin, you will still get the two emails. You will need to completely remove the plugin.
I don't know if everyone has this problem, or if it is limited, I just know that I've seen and reported it, as have others, so it is not a completely isolated situation.
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