pflogsumm.pl is designed to provide an over-view of postfix
activity, with just enough detail to give the administrator
a "heads up" for potential trouble spots. The following is
an over-view of the reports produced:
* Total number of:
	* Messages received, delivered, deferred, bounced and forwarded
	* Bytes in messages received and delivered
	* Sending and Recipient Hosts/Domains
	* Senders and Recipients
	* Optional SMTPD totals for number of connections

and many many more.

WWW: http://jimsun.LinxNet.com/postfix_contrib.html