Another choice is:
+++ For exim:
- ensure /etc/logrotate.conf has "notifempty" as a global option (not in a curly bracket group).
- create the missing log file;
-- mkdir /var/log/exim/
-- touch /var/log/exim/log.
Now logrotate will not complain and, should you in future enable esim, logrotate will rotate its logs without requiring any further intervention from you.
+++For prelink
chmod a-x /etc/cron.daily/prelink
cron will then not try to execute that file