Check whether if exim and spamd enabled in the following file
/etc/chkserv.d/chkservd.conf
Remove if exist
rm -fv /etc/spamdisable
Restart exim
service exim start
Notes
Check whether if exim and spamd enabled in the following file
/etc/chkserv.d/chkservd.conf
Remove if exist
rm -fv /etc/spamdisable
Restart exim
service exim start