Problem

If you want to send an Email via carbon copy (cc) or blind carbon copy (bcc) to someone else besides the actual recipient, you have to click on either "Kopie" (=cc) or "Blindkopie" (=bcc).
This was confusing to most of my test subjects, because they are used to the terms "cc" and "bcc" respectively, due to the fact that they are used in most of the established mail programs.

As you can see in the bottom left corner of the picture, there seems to exist an option, where you can select between "cc" and "bcc", but this option is inactive