Many users have reported that syslog needs restarting otherwise the maillog file doesn't fill up and the pflogsumm emails just report zero emails. This seems to happen on RedHat based systems (Fedora, RHEL, CentOS).

The fix for this is to change the appropriate section of /etc/logrotate.conf to look like this:

 /var/log/maillog {
    missingok
    daily
    rotate 7
    create
    compress
    start 0
    postrotate
        /bin/kill -HUP `cat /var/run/syslogd.pid 2> /dev/null` 2> /dev/null || true
    endscript
}

Additionally, to the previous poster, there is no double-reporting of emails when used with amavisd - this problem is overcome within the tutorial.