Autor: Marc Perkel Data: A: exim-users Assumpte: [Exim] This might be a useful spam catching trick - Improved
# Tag message with sender's IP nameserver record.
# This can be processed with Spam Assassin
# Does IP NS lookup (W.X.Y.Z) on Z.Y.X.in-addr.arpa and Z.Y.in-addr.arpa