Following the Rules
Besides the built-in spam filter, you can create as many of your own filters as you want. Most of these filters will be used in one of two ways. First, you can create rules that move messages from trusted senders into mailboxes that you create specifically for them. Alternatively, you can create filters that look out for particular characteristics of spam e-mail and move any such messages to the Junk folder.
One of the key things to understand about these rules is that they are followed in the order in which they are arranged in the Rules window. So it is best to place filters that move messages from trusted senders toward the top of the list and the messages that filter off spam toward the bottom. This ensures that messages from those trusted senders won’t accidentally be treated as spam—even if they decide to write to you all about their cheap Viagra and awesome mortgage!
Figure 2 Your filtering rules are applied in the order in which they appear in the Rules window. Once you understand that, you can unleash their full potential!