SpamAssassin has been disabled in Tweak Settings and spamd has been disabled in service manager as the install docs states.
I tried removing spamd_address from exim.conf and regenerating exims configuration with /scripts/buildeximconf and the spamd_address variable came back.
If you previously had cPanel's spamassassin enabled on this server or have transferred accounts from a server that did, you should check to make sure there is no .spamassassinenable file in any of the user accounts. See this post for the command to use: viewtopic.php?p=9949#p9949