Thanks for the quick answer.
In the newsletter main settings it’s configured right.
If I look at the “Status” page I can see in the field “your server” the IP address and the servername. So I thought, that the information somehow was send.
If I send a mail from this address to my googlemail with a standard mail app, I can’t see this information. Then it shows my configured name and mail address.
But I also tried an other newsletter tool and I had the same problem.
So I will ask tomorrow the provider about the settings. Thank you for the info, I hope it will solve it.