Checking logs is the only way to know what’s happening with your servers and one way to check them is using Logwatch.
Installing it on Debian is easy:
apt-get install logwatch
On my virtual Debian host there was no configuration file in the expected place so I copied it from /usr/share/logwatch/default.conf folder:
cp /usr/share/logwatch/default.conf/logwatch.conf /etc/logwatch/conf/
Things you must change in this file are:
Output = mail
MailTo = email@example.com
Detail = High
The rest is optional and subject to your needs. The logwatch.conf is well documented.
Create folder /var/cache/logwatch needed by logwatch as specified in logwatch.conf.
# mkdir /var/cache/logwatch
Test the setup by running:
To finish the automatism edit the /etc/cron.daily/00logwatch file, removing --mailto: root option to receive mails to the address we specified in logwatch.conf file.