thanks for the email address! That is one I was looking for, and even now knowing what to look for I cannot find it. Yes my questions are now fully answered :).
Shouldn't that firstname.lastname@example.org be visible somehow specially through the user mapillary's web-ui?
Now that I have noticed (it wasn't obvious) that comment tool (above my little red square in the picture) and the edit tools with also commenting possibilities, I feel my needs are covered :). The support@mapillary is perhaps necessary to solve general questions.