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+Status/Shape of Mail Queue
+Postfix maintains different queues for different purpose.active  and  deferred queues are of our interest.
+Ideally, we should never have a mail in deferred queue.
+qshape command will show shape of active mail queue by default. Ideally it should be as close as to empty since postfix sends email instantly!
+<code>
+qshape
+</code>
+Sample Outputs:
+<code>
+       T  5 10 20 40 80 160 320 640 1280 1280+
+TOTAL  0  0  0  0  0  0   0   0   0    0     0
+</code>
+If a mail is deferred, it will be moved to deferred queue.
+Running following command will show you the number of deferred emails for each domains…
+<code>
+qshape deferred
+</code>
+Sample Output:
+<code>
+               T  5 10 20 40 80 160 320 640 1280 1280+
+        TOTAL  5  0  0  0  0  0   0   0   0    0     5
+    gmail.com  4  0  0  0  0  0   0   0   0    0     4
+    yahoo.com  1  0  0  0  0  0   0   0   0    0     1
+</code>
+If you see mails to one or more domain only being deferred, check if you can connect to those servers from your network.
+Analyze mails in queue
+Dump entire mail queue
+You can use either mailq or postqueue -pcommand. They will show an output like below:
+<code>
+-Queue ID- --Size-- ----Arrival Time---- -Sender/Recipient-------
+FC8824D24    10588 Thu Sep 27 14:52:41  from.me@example.com
+(connect to alt2.gmail-smtp-in.l.google.com[74.125.79.26]:25: Connection timed out)
+                                         some.user@gmail.com
+-- 16 Kbytes in 2 Requests.
+You get dump for all emails from all mail queues including active & deferred queue.
+</code>
+Read an email from mail queue
+Every message in queue has a unique id. You can read message in queue using a command like:
+<code>
+postcat -q  DA80E24A0A
+</code>
+Or
+<code>
+postcat -qv  DA80E24A0A
+</code>
+It will display your emails with headers and some more info. Using ‘v’ will display extra information.
+Attempt to send an email from mail queue
+Its better to first open postfix log using something like below:
+<code>
+tail -f /var/log/mail.{err,log}
+</code>
+Then you can identify a stuck mail and attempt to send it by using:
+<code>
+postqueue -i DA80E24A0A
+</code>
+If that mail gets stuck again, check log tab to find reason.
+Once you fix issue, you can attempt to send that mail again. Mail ID inside queue remains same even if mail gets deferred again and again.
+Attempt to send all email from mail queue
+Once you rectify issue and confident about delivery, you may try flushing entire queue immediately using:
+<code>
+postqueue -f
+</code>
+Deleting Pending mails from queue
+Sometimes you realize that all stuck emails are being sent to non-existent emails. Most likely emails generated because of some spam activity.
+Delete All Deferred Mails
+In that case, you can simply delete all queued mails using:
+<code>
+postsuper -d ALL deferred
+</code>
+Delete a single mail from queue
+If you want to just delete one mail, you can try:
+<code>
+postsuper -d DA80E24A0A
+</code>
+Delete mails to a specific mail address
+You need to some work here as postfix has no direct command for this.
+Following sample is taken from postsuper man page:
+<code>
+mailq | tail -n +2 | grep -v '^ *(' | awk  'BEGIN { RS = "" } { if ($8 == "USER@EXAMPLE.COM" && $9 == "") print $1 } ' | tr -d '*!' | postsuper -d -
+</code>
+Just replace USER@EXAMPLE.COM with receiver email address.
+$8 will contain recipient1 email-address, $9 will contain recipient2 email-address.
+If you want to filter from-email address, use $7 variable.