Run the following commands from root
/scripts/perlinstaller Digest::SHA1
/scripts/perlinstaller --force Mail::SpamAssassin
/scripts/fixspamassassinfailedupdate
/scripts/updatenow
/scripts/installspam --force
/scripts/exim4 --force
/etc/rc.d/init.d/exim restart
/scripts/restartsrv spamd
/etc/rc.d/init.d/chkservd restart