Download and install Mac OS X 10.3.3 Update or later to avoid this issue.
If you're not ready to install, these tips can help:
- Open the Mail application.
- From the Mail menu choose Preferences.
- Click Junk Mail.
- Click the Reset button.
- Click "Yes" in the alert window that asks if you want to reset Junk Mail training.
You may wish to
turn on Junk Mail training if it isn't already on.