Milter-greylist

Hi,

I'd like to whitelist IPs listed on lists.dnswl.org with trust "high", 
which means a return code of

   127.0.x.3

x can be a value from 2 up to 15, depending on the category of the 
sending host ( see: https://www.dnswl.org/?page_id=15#returncodes ).

How would a dnsrbl rule look like? Are regular expressions allowed?

   dnsrbl "MTAWL" list.dnswl.org ????

Ciao!