[OSM-dev] Returning email address when authenticated by OSM API?

[Lambertus]

The API used to return the users email address when they are authenticated 
by the OSM API. The email address is used by the forum to let users send 
private email to the administrator or each other. Unfortunately this isn't 
possible since the API does not return the email address anymore.

I have no idea when this behaviour changed, but forum-wise this is an 
unwanted change. Can someone shine a light on this?