Maybe I didn’t describe well what I was trying to accomplish.
The screenshots were not intended as a description of the problem, but rather to show the reader which user setting I was talking about.
I basically want the notification checkboxes for new agents to be unchecked. After the first login every agent should choose the groups he wants to be notified about.
Here is a description in which file the settings for e-mail notifications can be edited.
Unfortunately I can’t find a file where I can set that all groups are unchecked by default.
I hope I have expressed myself a little better.