http://gnufreakz.wordpress.com/2010/06/08/postfix-queue-management

http://blog.gtuhl.com/2008/08/14/basic-postfix-queue-management

http://postfixmail.com/blog/index.php/manage-mail-in-the-deferred-queue/

These systems use Postfix as the MTA:

• Virtualmin
• Zimbra

postqueue -p

View a particular message:

postcat -q <queueID> | head --lines 100

grep "Nov 13 06:13:" /var/log/maillog*

grep "D233911382F9" /var/log/maillog*

• Default queue_run_delay (interval between send attempts) is 300s or 300 seconds

Attempt to send queued mail now:

postqueue -f

View a deferred message:

postcat -q 022412012A | head -40

or:

postcat /var/spool/postfix/deferred/0/022412012A

To delete all email in the queue from a domain run this command as root:

postqueue -p | tail -n +2 | awk 'BEGIN { RS = “” } /@example\.com/ { print $1 }' | tr -d '*!' | postsuper -d -

To delete all email in the queue From: a specific email address run this command as root:

postqueue -p | tail -n +2 | awk 'BEGIN { RS = “” } /username@example\.com/ { print $1 }' | tr -d '*!' | postsuper -d -

To delete all queued mail:

postsuper -d ALL

Untested!

http://www.cyberciti.biz/tips/howto-postfix-flush-mail-queue.html

Once you list queued messages with postqueue -p and determine a reg-ex pattern of files you want to delete, you can use the following script to do the deletions.

The following script deletes all mail from the any queue which matches the regular expression specified as the first argument.

#!/usr/bin/perl
 
$REGEXP = shift || die "no email-adress given (regexp-style, e.g. bl.*\@yahoo.com)!\n";
 
@data = qx</usr/sbin/postqueue -p>;
for (@data) {
  if (/^(\w+)(\*|\!)?\s/) {
     $queue_id = $1;
  }
  if($queue_id) {
    if (/$REGEXP/i) {
      $Q{$queue_id} = 1;
      $queue_id = "";
    }
  }
}
 
#open(POSTSUPER,"|cat") || die "couldn't open postsuper" ;
open(POSTSUPER,"|postsuper -d -") || die "couldn't open postsuper" ;
 
foreach (keys %Q) {
  print POSTSUPER "$_\n";
};
close(POSTSUPER);

For example, to delete all queued messages from or to the domain called fackspamdomain.com, enter:

./postfix-delete.pl fackspamdomain.com

Delete all queued messages that contain the word xyz in the e-mail address:

./postfix-delete.pl xyz

http://stackoverflow.com/questions/226699/how-to-monitor-postfix-mta-status

This script monitors queues and sends an alert via another mail server.

#!/bin/bash
#
# Postfix queue length monitoring script (requires msmtp)
#
# This script checks the active, incoming, deferred and maildrop postfix queue directories.
#
# If the number of messages in any of these directories is more than $MAX_QUEUE_LENGTH,
# the script will generate an alert email and send it using msmtp. We use msmtp so that
# we can bypass the local postfix installation (since if the queues are getting big,
# the alert email may not be sent in time to catch the problem).
#

#########################################################
# SET SCRIPT VARS
#########################################################

# Path to msmtp binary (e.g. /usr/bin/msmtp on Debian systems)
MSMTP=/usr/bin/msmtp

# Remote mail host (this is the mail server msmtp will use to send the alert. It should NOT be the local postfix installation)
MAILHOST=backup.mailserver.com

# Remote mail port
MAILPORT=25

# Mail protocol
MAILPROTO=smtp

# Fully qualified domain name of local postfix installation
DOMAIN=primary.mailserver.com

# From address
MAILFROM=postmaster@mailserver.com

# Recipient (this address should not route to the local postfix installation, for obvious reasons)
MAILTO="alerts@anotherdomain.com"

# Email subject
MAILSUBJECT="Postfix queue length alert for ${DOMAIN}"

# MSMTP log file
LOGFILE=/var/log/msmtp.log

# Root of the postfix queue dirs (e.g. /var/spool/postfix on Debian systems). Note: no trailing slash.
QUEUEDIR_ROOT="/var/spool/postfix"

# Max queue length (if there are more messages in a queue than this number, we will send an alert)
MAX_QUEUE_LENGTH=10


#########################################################
# SCRIPT LOGIC STARTS HERE
#########################################################

# Check msmtp binary exists
if [ ! -f ${MSMTP} ]
then
        echo "Cannot find ${MSMTP}. Exiting."
        exit 1
fi

# Get the number of messages sitting in each postfix queue directory
Q_ACTIVE=$(find ${QUEUEDIR_ROOT}/active -type f | wc -l)
Q_INCOMING=$(find ${QUEUEDIR_ROOT}/incoming -type f | wc -l)
Q_DEFERRED=$(find ${QUEUEDIR_ROOT}/deferred -type f | wc -l)
Q_MAILDROP=$(find ${QUEUEDIR_ROOT}/maildrop -type f | wc -l)

# If any of these queues contain more than $MAX_QUEUE_LENGTH issue an alert
if [ ${Q_ACTIVE} -gt ${MAX_QUEUE_LENGTH} -o ${Q_INCOMING} -gt ${MAX_QUEUE_LENGTH} -o ${Q_DEFERRED} -gt ${MAX_QUEUE_LENGTH} -o ${Q_MAILDROP} -gt ${MAX_QUEUE_LENGTH} ]; then

    (
        echo "From: ${MAILFROM} "
        echo "To: ${MAILTO} "
        echo "Mime-Version: 1.0"
        echo 'Content-Type: text/plain; charset="iso-8859-1"'
        echo "Subject: ${MAILSUBJECT}"
        echo ""
        echo "One or more of the postfix queues on ${DOMAIN} has grown beyond ${MAX_QUEUE_LENGTH} messages in length."
    ) | ${MSMTP} --host=${MAILHOST} --port=${MAILPORT} --protocol=${MAILPROTO} --domain=${DOMAIN} --auth=off --tls=off --from=${MAILFROM} --logfile=${LOGFILE} --syslog=off --read-recipients

    exit 2

fi

exit 0

http://exchange.nagios.org/directory/Plugins/Email-and-Groupware/Postfix/Postfix-Queue-Monitor/details

http://www.paessler.com/knowledgebase/en/topic/21223-monitoring-e-mail-queue-on-postfix