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==Install qmqtool for Qmail on Centos==

Now that you have installed Qmail, you will probably want to install and use qmqtool.  This tool helps you manage the mail when using qmqtool.

Qmqtool - a qmail queue manipulation program geared towards the viewing and safe modification of the contents in a qmail queue

Qmqtool is a utility designed for viewing and safely modifying the contents of a qmail queue. It is extremely feature rich, with features including finding abusers, sorting messages by sender/sender's IP, showing stats, requeueing messages, queue consistency check, queue backup/restore, and more...

 cd /downloads/
 wget http://www.briansnelson.com/stuff/qmail/qmqtool-1.14.tgz
 tar zxvfp /downloads/qmqtool-1.14.tgz
 cd /downloads/qmqtool-1.14/
 ./configure --perl=/usr/bin/perl --qmaildir=/var/qmail
 make && make install 
 ln -s /usr/local/script/qmqtool /usr/local/bin/qmqtool 

Thats it now your done, Just type qmqtool to see how to use it.
 
I also have that in a script, so when I install qmail on a new server, I just download the script and run it.  If you would like you can download the script and run also, instead of type the above out.
 
 mkdir /scripts
 cd /scripts
 wget http://www.briansnelson.com/stuff/qmail/install-qmqtool.script
 bash install-qmqtool.script

Here are a few examples on how to use qmqtool

===Usage samples===

List all messages in the queue having the subject "XXX" (case insensitive)
 qmqtool -f '/^subject: xxx/i'

Delete all messages in the queue having the subject "XXX" (case insensitive)
 qmailctl stop
 qmqtool -d -f '/^subject: xxx/i'
 qmailctl start

Who are the top senders for the remote queue
 qmqtool -R | grep "From: " | sort | uniq -c | sort -rn | head -20

Who are the top recipients of the remote queue
 qmqtool -R | grep "To: " | sort | uniq -c | sort -rn | head -20
 qmqtool -R | grep "Envelope Recipient: " | sort | uniq -c | sort -rn | head -20

What are the top subjects of the remote queue
 qmqtool -R | grep "Subject: " | sort | uniq -c | sort -rn | head -20

What domains are being sent the most mail from the server
 qmqtool -R | grep "To: " | cut -d @ -f2 | tr -d '>' | sort | uniq -c | sort -rn | head -20
 qmqtool -R | grep "Envelope Recipient: " | cut -d @ -f2 | awk '{print $1}' | tr -d '>' | sort | uniq -c | sort -rn | head -20

Who are the top receivers for the local queue
 qmqtool -L | grep "To: " | sort | uniq -c | sort -rn | head -20
 qmqtool -L | grep "Envelope Recipient: " | sort | uniq -c | sort -rn | head -20

What domains are have the most mail in the local queue
 qmqtool -L | grep "To: " | cut -d @ -f2 | tr -d '>' | sort | uniq -c | sort -rn | head -20
 qmqtool -L | grep "Envelope Recipient: " | cut -d @ -f2 | awk '{print $1}'

Who most of my remotely queued messages are destined for ?
 qmqtool -R | awk '/Recipient:/ { print $3 }' | sort | uniq -c | sort -n

How can I expire messages with a subject of "Failure Notice" that are have been queued for 18+ hours ?
 qmqtool -V -e -o 18 -f '^Subject: Failure Notice' 

===Additional articles: ===
coming soon...