That's an email address, not the headers in the email which give details of the specific route the email took.
That said, it's extremely doubtful there would be such a thing from a German t-online.de domain. I'd automatically treat it as a phishing attempt to gain your login information.
* Disclaimer: I am a HughesNet customer and not a HughesNet employee. All of my comments are my own and do not necessarily represent HughesNet in any way.
