<p>I think this is an interesting idea, but perhaps providing editor-specific messages might be quite complex. Would it be fair to say that the central issue with contacting Maps.me users is that:</p>
<blockquote>
<p>Often, they do not seem to be completely aware of OSM, they don't even know that they are registered users of it.</p>
</blockquote>
<p>I assume this means that they didn't get (or ignored) the sign-up message from OSM? Perhaps that doesn't get sent for OpenID-style signups?</p>
<p>Would a simpler first step be to insert some header / footer text to the email to say something like this?</p>
<blockquote>
<p>You are receiving this email because you contributed a change to map or POI data on OpenStreetMap, possibly through a map app, and another contributor has a comment about it.</p>
</blockquote>

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