One could do all the configuration steps manually, but we have written a configuration tool to help you with the process. Log on to any linux computer in the department, and type the command "/usr2/Init/spamconfig". After that, just follow instructions.
It is worth mentioning some things about the so-called spam level. Spam Assassin computes the spam level based on its interpretation of the headers from the mail, as well as textual content. For example, the phrases "work at home", "completely free", and "click below" all increase the spam level. Likewise, mail headers that indicate that mail is not actually from the putative "From" address increase the spam level. A few things, such as mail coming from a known address that can be verified, actually decrease the spam level. Short emails within the department might actually have a negative spam level. WSU announcements typically come it at about a spam level of 1-3. Some legitimate newsletters and manufacturers announcements can be evaluated as high as level 5 or 6. It is fairly uncommon (but possible) to see legitimate mail with a spam level over 6. For that reason, the official WSU spam level is 6. We recommend that you set your spam filter level to 6. However, this is up to you. You might want to filter your mail more stringently than that, by setting your spam level to 5, for example. On the other hand, you might receive a newsletter from a site that routinely comes in with spam level 7.5. In that case, you might want to set your filter to leave mail with a spam level lower than 8 alone. You can always change the spam level at which you filter your mail by running spamconfig again.
Mail that is filtered is not usually deleted. It is put in a directory that you specify. You can then review that mail using your favorite text editor, and delete it at your convenience. If you do not ever want to see the mail that is evaluated as spam, you could specify that spam be sent to the "directory" called /dev/null. This deletes the message. Be careful in using that setting.