[exim] Need help with hostlist

Hello, 
       I need help with a hostlist. 

Currently I have:

hostlist auth_hosts       = !127.0.0.1 : !localhost : \
                            !130.149.0.0/16 : \
                            !141.23.0.0/16 : \
                            *

But I want "*.vpn.tu-berlin.de" to be in this list to force auth.

All my tries to understand the docu failed.



Kind regards,
Frank Elsner