Novell GroupWise 8
Novell GroupWise 8 GWIA
Novell GroupWise 8 Hot Patch 2
When you install SLES by default IPv6 is enabled, this makes the GWIA use the IPv6 numbers and any lookup on the RBL will fail as this only reports IPv4 numbers.
Reported to Engineering.
When you disable IPv6 on the server the RBL is working again.