Pflogsumm is an oldie but a goodie. It’s a Perl script that sifts through your Postfix server maillog and provides you with a neat summary of events and some statistics. This information can be useful in detecting sudden changes in your normal mail flow. Here’s how to install pflogsumm on CentOS/RHEL:

First, some prerequisites for Perl:

yum install perl-Date-Calc

Now pflogsumm itself:

mkdir -p /usr/local
cd /usr/local/
curl -O http://jimsun.linxnet.com/downloads/pflogsumm-1.1.3.tar.gz
tar -xzf pflogsumm-1.1.3.tar.gz
/bin/mv pflogsumm-1.1.3 pflogsumm
chmod +x pflogsumm/pflogsumm.pl

A sample run:

perl /usr/local/pflogsumm/pflogsumm.pl /var/log/maillog

A more practical example using cron to email you daily stats of your Postfix server activities:

0 0 * * * perl /usr/local/pflogsumm/pflogsumm.pl /var/log/maillog | mailx -s "`hostname` Postfix Summary for `date +'%Y-%m-%d'`" you@yourdomain.com >/dev/null 2>&1