Double-click the SpamSieve-2.7.1.dmg file to mount the SpamSieve disk image. Then drag the SpamSieve application to your Applications folder. It is important that SpamSieve be installed directly in the Applications folder (not in another folder, or in a subfolder), because otherwise your mail program might not be able to find it.

Next, you must follow the instructions for setting up SpamSieve to use it with your e-mail program. After setting up SpamSieve, you will need to train it with examples of your spam messages and good messages.