CmdrTaco from the near-and-dear-to-my-heart dept.
Ramakrishnan M writes "Paul Graham, the Lisp Guru is back with a great technique to fight spam. It is based on trust matric, and he claims, only 5 out of 1000 spams got leaked out of this system with 0 false positives. Worth looking at."
Be careful when a loop exits to the same place from side and bottom.