dnsblog dnswl problem ?

[Marko Weber | ZBF]

hello,
i use list.dnswl.org in postscreen_dnsbl_sites .

in the logfiles i see:

Sep 19 12:17:18 mail postfix/dnsblog[15318]: warning: dnsblog_query: 
lookup error for DNS query 35.64.91.217.list.dnswl.org: Host or domain 
name not found. Name service error for name=35.64.91.217.list.dnswl.org 
type=A: Host not found, try again

does this mean dnswl.org ist not reachable ? or is postscreen not able 
to use dnswl.org ?

thanks

marko