Use "Magnets" Conservatively in POPFile

Thales of Miletus (yes, the Thales who had this curious encounter with a well and a Thracian girl) was amazed by the magnetic power of the loadstone. The only route to go if we want to explain this strange power, he said, is in analogy to other strange powers that we can't fail to notice: those in living beings.
Now, POPFile doesn't move anything but email, but it still has magnetic power, which it is best not to touch:
As tempting as it may be to whitelist all your friends, you shouldn't do it in POPFile. Here's why, and why you should stay away from POPFile's "magnets" altogether.