Sender_net_reject - dbm lookup?

As it seems to me email spamming may get a whole lot worse before it
starts to gets better (if ever), I was wondering if it would make any
sense to make it possible to look up the net addresses from a dbm file
rather than having a huge list in my configure file.

-- 
      Artificial Intelligence stands no chance against Natural Stupidity.
                GAT d- -p+(--) c++++ l++ u++ t- m--- W--- !v
                     b+++ e* s-/+ n-(?) h++ f+g+ w+++ y*