On the top panel, visit System -> Administration -> Synaptic Package Manager.
Search for "spamassassin".
Install "spamassassin" and any dependencies it requires.
- Launch Evolution.
Go to Edit -> Preferences -> Mail Preferences -> Junk.
Enable at least the first option box, "Check incoming mail for junk."
Go to Mail Accounts, select your email account, and click [Edit].
Click the Receiving Options tab, and select "Check New Messages For Junk Content". MurrayCumming: My Evolution (in Breezy) does not have this option. Maybe it has been removed, because it seems like duplication. ["Matthew5"]: Nor does mine.
Spamassassin itself requires no setup in most cases. If you really wanted to know all that, open the Gnome Help browser (System -> Help), type Ctrl-l (for "Location), and in the box type "man:spamassassin". Alternatively, you could open a terminal (Applications -> Accessories -> Terminal) and type "man spamassassin". There is additional documentation in "/usr/share/doc/spamassassin". (Places -> Home Folder, type Ctrl-l (Location), then enter "/usr/share/doc/spamassassin".)