Often friendly messages are the best way to sort things out. But once it's discussed in a group (e. g. mailing list) make it clear to others that you're messaging the user, this stops everyone else bombarding their inbox.
If anybody is wanting a place to play with OSM tools, take a look at http://opengeofiction.net Beware if using JOSM, its not easy to flick between live/fictional servers.
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