honey pot

honey pot
 n.

   1. A box designed to attract {cracker}s so that they can be observed
   in action. It is usually well isolated from the rest of the network,
   but has extensive logging (usually network layer, on a different
   machine). Different from an {iron box} in that its purpose is to
   attract, not merely observe. Sometimes, it is also a defensive network
   security tactic -- you set up an easy-to-crack box so that your real
   servers don't get messed with. The concept was presented in Cheswick &
   Bellovin's book Firewalls and Internet Security.

   2. A mail server that acts as an open relay when a single message is
   attempted to send through it, but discards or diverts for examination
   messages that are detected to be part of a spam run.