I have an iMac and a MacBook Pro. Mail is configured exactly the same on both. Specifically: 1) Under Preferences->Junk->Exempt: the "Sender of message is in my Address Book" is checked. 2) There are no Rules other than the default. Junk filtering works well on the MacBook Pro (a newer install that has been "learning" for a month or two. The iMac on the other hand insists on moving messages from known senders to the Junk folder. By known sender, I mean addresses that are in my address book. The iMac is 2 years old so I'm assuming it has "learned" much more about junk mail than the MacBook. Can anyone give me suggestions as to how I can fix this? I'd be willing to reset the junk history on the iMac if someone can tell me how. Both systems are running up-to-date Leopard. Thanks.