Spamassassin

[Jason -]

Hello. I have Ubuntu 15.04 and have configured Amavisd-new according to this ( 
https://help.ubuntu.com/14.04/serverguide/mail-filtering.html ).
However, when carefully examining all headers of mail received I only see 
"X-Virus-Scanned: Debian amavisd-new at ...", I don't see any "X-Spam-Status" 
or something similar... Why is this happening? How can I correct this?
Regards,
Jason