I noticed that only users with the admin-role can access the newsletter panel.
I want to enable a user with the “editor-role” to write and edit newsletters etc. but it seems that there is no way to realize it.
I don’t want to authorize a user to be an administrator just because he is responsible for the newsletter.
That is very dangerous.
I am sorry! I found your answer on a previous, identical question here after I posted my question. Sorry for that and thank you for your help and patience!