# portsnap fetch update
# /usr/ports/sysutils/logwatch
# make install clean
# cp /usr/local/etc/logwatch/defaults/logwatch.conf /usr/local/etc/logwatch/defaults/logwatch.conf_bak
# vi /usr/local/etc/logwatch/defaults/logwatch.conf

MailTo = admin@example.com
Set Print to No:
Print = No

# crontab -e

### Logwatch cron job ###
@daily /usr/local/sbin/logwatch.pl

参考
FreeBSD Install Logwatch Tool For Log Analysis and Monitoring
FreeBSD Daily Topics：2008年7月14日