"This article describes how you can monitor your Postfix
mailserver with the tools Mailgraph and pflogsumm. Mailgraph
creates daily, weekly, monthly, and yearly graphs of sent,
received, bounced, and rejected emails and also of spam and
viruses, if SpamAssassin and ClamAV are integrated into Postfix
(e.g. using amavisd-new). These graphs can be accessed with a
browser, whereas pflogsumm ("Postfix Log Entry Summarizer") can be
used to send reports of Postfix activity per email.
"In this tutorial my Linux system has the IP address
192.168.0.100 and hosts the web site http://www.example.com with
the document root /var/www/www.example.com/web and a cgi-bin
directory of /var/www/www.example.com/cgi-bin, and I will send the
pflogsumm reports to the email address email@example.com."