I have this message when I try to set what you told me :
You have chosen to use the spamc client program, but the spamd server does not appear to be running
Ichanged the /etc/default/spamassasin I put a 1 instead of 0 to activate the spamd
Retry to switch to the daemonized version of those services (spamc and clamdscan) => seems to work.
Send a new mail => then YEAH !!!
Roudcube told me you recieved a new mail