If you are looking to filter spam or junk email with Evolution 2.0, you may want to review the documentation at
Novell's Evolution page..
When email arrives. click the Junk button to identify Junk Email.
Go to Tools->Filters and click to add a new filter. From the drop-down list choos "Junk Test." Then select, "Message is Junk" to the right.
Create a new folder to hold spam email. In the lower box, choose to move the junk email to the new folder.