Code:
iphone:~# /etc/init.d/exim4 restart
Stopping MTA for restart:/sbin/start-stop-daemon: warning: failed to kill 2832: No such process
 exim4_listener.
Restarting MTA: exim4.
ALERT: exim paniclog /var/log/exim4/paniclog has non-zero size, mail system possibly broken failed!

you will see this message everytime when exim4 starts and the paniclog is none-empty on a Debian / Ubuntu system,
Simply it can be resolved by:
Code:
rm /var/log/exim4/paniclog
to fix the above error.