Installing qmailstats will give you information as a server administrator that you can use to check many different aspects of qmail. This report will give you stats on incoming messages, failed messages and a lot more information. 

 First, let's install qmailanalog:

# cd /usr/ports/mail/qmailanalog
# make install clean

That's it. Qmailanalog is installed!

Now let's install qlogtools: 

# cd /usr/ports/sysutils/qlogtools
# make install clean

Ok. The qlogtools library of tools should now be installed.

Now we will implement a script to run Qmailanalog and then you can hook that script into the server's crontab to get stats generated every night. 

# cd /var/qmail/bin
# fetch http://freebsdrocks.net/files/qmailstats

The script below is a solid script that sends an email to the server administrator with both the qmailanalog output as well as qms-analog's readout of qmail-scanner's activities. Find the lines in the script where it says: 

echo "To: This e-mail address is being protected from spambots. You need JavaScript enabled to view it " > $EMAILMSG
echo "From: This e-mail address is being protected from spambots. You need JavaScript enabled to view it " >> $EMAILMSG
echo "Subject: Nightly Qmail Stats Report for $DATE" >> $EMAILMSG

And changing the subject line is optional but I would change the email address in the to and from unless you don't want the report to get emailed to you. 

# vi /var/qmail/bin/qmailstats


#!/bin/sh
## qms-analog and qmailanalog invocation script
##
## Note: For better readability of the nightly stats email, set your email
## client font to a fixed width font - then all the columns line up
## very nicely.
##

PATH=/usr/local/qmailanalog/bin:/var/qmail/bin:/bin:/usr/bin:/usr/local/bin
QMAILSTATS="/tmp/q.$$"
EMAILMSG="/tmp/qms.$$"
umask 077
DATE=`date +'%D'`

## prepare qmail log entries for qmailanalog routines
cat /var/log/qmail/qmail-send/* /var/log/qmail/qmail-pop3d/* /service/qmail-smtpd/log/main/* | tai64n2tai | awk '{$1=substr($1,1,index($1,".")+6);print}' | matchup > $QMAILSTATS 5>/dev/null

## build the email message header
echo "To: This e-mail address is being protected from spambots. You need JavaScript enabled to view it " > $EMAILMSG
echo "From: This e-mail address is being protected from spambots. You need JavaScript enabled to view it " >> $EMAILMSG
echo "Subject: Nightly Qmail Stats Report for $DATE" >> $EMAILMSG
echo "" >> $EMAILMSG
echo "" >> $EMAILMSG

## qms-analog invocation
#
# USAGE: qms-analog hours-of-history <sort-key>
#
# hours-of-history (0 - n) hours of history to collect
# 0 => all records
# sort-key (optional) sort key for account statistics
# msgbw (default) msg bandwidth - successful msgs
# alpha alphanumeric by account name
# virus number of viruses received
# saavg Spamassassin avg score
# sadet Spamassassin msgs detected
#
# Examples:
# "qms-analog 24" - use only records within the last 24 hours,
# sort by msg bandwidth
# "qms-analog 168" - use only records within the last 7 days,
# sort by msg bandwidth
# "qms-analog 0" - use all records, sort by msg bandwidth
# "qms-analog 0 alpha" - use all records, sort alphabetically
# "qms-analog 0 saavg" - use all records, sort by Spam average score
#
# Note: Add or remove statistical time frames to suit your preference -
# "last 24 hours" and "all records" are uncommented below by default.
##

#### Last 24 hours
echo "~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~" >> $EMAILMSG
echo "~~~~~~~~~~~~~~~~~~~~~~~~~~ L a s t 2 4 H o u r s ~~~~~~~~~~~~~~~~~~~~~~~~~~~" >> $EMAILMSG
cat /var/spool/qmailscan/qms-events.log | qms-analog 24 >> $EMAILMSG
####

#### Last 7 days
#echo "" >> $EMAILMSG
#echo "~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~" >> $EMAILMSG
#echo "~~~~~~~~~~~~~~~~~~~~~~~~~~ L a s t 7 D a y s ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~" >> $EMAILMSG
#cat /var/spool/qmailscan/qms-events.log | qms-analog 168 >> $EMAILMSG
####

#### Last 30 days
#echo "" >> $EMAILMSG
#echo "~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~" >> $EMAILMSG
#echo "~~~~~~~~~~~~~~~~~~~~~~~~~~ L a s t 3 0 D a y s ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~" >> $EMAILMSG
#cat /var/spool/qmailscan/qms-events.log | qms-analog 5040 >> $EMAILMSG
####

#### All records in qms-events.log
echo "" >> $EMAILMSG
echo "~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~" >> $EMAILMSG
echo "~~~~~~~~~~~~~~~~~~~~~~~~~~ A l l R e c o r d s ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~" >> $EMAILMSG
cat /var/spool/qmailscan/qms-events.log | qms-analog 0 >> $EMAILMSG
####

## qmailanalog invocation
echo "" >> $EMAILMSG
echo "" >> $EMAILMSG
echo "~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~" >> $EMAILMSG
zoverall < $QMAILSTATS >> $EMAILMSG
echo "" >> $EMAILMSG
echo "" >> $EMAILMSG
echo "~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~" >> $EMAILMSG
zfailures < $QMAILSTATS >> $EMAILMSG
echo "" >> $EMAILMSG
echo "" >> $EMAILMSG
echo "~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~" >> $EMAILMSG
zdeferrals < $QMAILSTATS >> $EMAILMSG
echo "" >> $EMAILMSG

## pipe the message into qmail-inject
cat $EMAILMSG | qmail-inject

## delete temp files
rm -f $QMAILSTATS
rm -f $EMAILMSG

Now set the script executable: 

# chmod 750 /var/qmail/bin/qmailstats

Now run the script: 

# /var/qmail/bin/qmailstats

Check your email and you should get a report with some pretty cool stuff in it!

OK, if the qmailstats script is working, you will now want to create a crontab entry to run this script every night.So, as the "root" user let's set up a cron entry: 

# crontab -e

And insert the following line: 

0 3 * * * /var/qmail/bin/qmailstats 1>/dev/null 2>/dev/null

Save and exit from the crontab editor and you should be all set. The above entry will run the qmailstats script every night at 3:00AM.