You have correctly identified that this is a legitimate email.

The URL (web address) in the status bar confirms that the link refers to “mein-paketservice.de.”

The only reliable indicator in an email is the URL behind the link. It is therefore important that you know where to find the URL behind a link and then check it carefully before clicking on a link.

Further information on how to verify the authenticity of messages can be found here: 
https://secuso.aifb.kit.edu/betr-nachrichten-flyer2