If you go to the Scripts page, using this link... http://xnotifier.tobwithu.com/scripts.php?key=name&dir=1 ...and look at the sixth script down the list, you'll see that arcor.de script is written by Michael Krämer ...if you cllick his name, you can email him to see if he can update the script and resubmit it to X-Notifier developer.
email author
If you go to the Scripts page, using this link...
http://xnotifier.tobwithu.com/scripts.php?key=name&dir=1
...and look at the sixth script down the list, you'll see that arcor.de script is written by Michael Krämer ...if you cllick his name, you can email him to see if he can update the script and resubmit it to X-Notifier developer.