This section, for Entourage 2004 and 2008 users, describes how to setup Entourage rules for SpamSieve if:
At this point, you should have followed the instructions in the previous section to create an Entourage rule for SpamSieve. Uncheck the Do not apply other rules… option for the rule so that it looks like this:

Then, create a second rule that looks like:

The action of the rule should be to move the messages to the Junk E-mail folder. After setting up the rule, make sure that the SpamSieve - Move Messages rule appears directly below the SpamSieve - Move If Spam rule in Entourage’s Rules window. Any additional rules that you want to process the non-spam messages should be listed below the SpamSieve - Move Messages rule.
Note: If you are using Gmail and IMAP with Entourage, change the criterion for the “SpamSieve - Move If Spam” rule from “All messages” to “Folder Is Inbox (Gmail).”