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

Delete all queued mail:

postsuper -d ALL

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

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)!";
 
@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