Postfix deferred

In this tutorial we will learn, how to delete mail queue in Postfix. To clear the mail queue in Postfix, we will use the command called postsuper. Abbreviation of postsuper is Postfix superintendent. Postsuper command is used for postfix mail queue related maintenance work. To check the mail queue in system, we use mailq command. It might be possible when you use mailq command,you may see long list of mails which are not delivered. Most of the mails have deferred status.

Scenario 1 : Remove particular mail queue id on running mailq command,you will get mail queue id. How do we receive the mails from gmail or outlook to linux box where postfix,mailx,dovecot installed.

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I am able to send the mails to outside of the network. Could you please help. The server is spammed and sending lots of emails. There are emails in the mail queue. I was trying to delete them by using above command. But it gives no output like : xx messages deleted. Because of mail in queue resisting to run the command.

I hope you are able to list mailq by using command postqueue -p. If yes, then you can achieve this by using one liner loop bash script. Before this I want to check are you able to remove single mail by using command postsuper -d give-mailq-id. Replace give-mailq-id with real mailq id which you got from command postqueue -p. I also need sample output from command postqueue -p. So that I can give you one liner looping bash command. Thank you for the reply.

First of all I am not able to delete any message by : postsuper -d give-mailq-id, That particular mail re-appears in mailq. Then I fired sudo postfix status which gave me output : the Postfix mail system is not running But surprisingly I am able to send and receive most emails. I suspect mail has been sent via some other MTA not by postifx. It could be sendmail or any other which is running on port 25 by default.

Good Information. I am not able to delete the mails from mail queue by using above commands. After using sudo postfix -d ALL, I am not getting any output. Any help will be appreciated.

There are many packages which help to setup mail server. Can you provide the information which mail server have you setup in your system is it postfix, sendmail,exim etc. Your email address will not be published. Notify me of follow-up comments by email. Notify me of new posts by email.

This site uses Akismet to reduce spam. Learn how your comment data is processed. He loves sharing the knowledge which earned from real scenarios.At Bobcares, we get many requests related to the Postfix mail queue, as a part of our Server Management Services. Postfix is one of the popular Mail Transfer Agents. It manages routing and mail delivery on the server. The undelivered mails are better known as deferred mails. Usually, Postfix lists these mails in the deferred queue.

Initially, our Support Engineers list the queue using the commands. Sometimes, there will be a large number of mails in the queue.

The postfix command to view the mails in tabular form is. It gives the output as:. Here, we analyze the emails and the reason for the mails to be in the deferred queue. Then, to clear this queue we use the command. Our Support Engineers with expertise in Server Administration often see various email errors. Recently, our customer had an error with deferred mails. The server was not trying to resend the deferred mails.

Firstly, our Support Engineers checked the log. It specified the reason as sender IP greylisted. However, resending was not happening. Therefore, we checked the Postfix configuration using the command. This lists important configuration.

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But, there was an error with the minimal and maximal backoff time.There are two queues within Postfix: pending and differed. The pending queue includes all messages that have been submitted to postfix which have not yet been sent out and handed off to the recipient server. The differed mail queue holds all messages that have soft-failed and need to be retired temporary failure. Postfix will retry sending the deferred queue on set intervals this is configurable, but is set to 5 minutes as a default.

NB: this command shows the sender and recipients and ID, not the message itself. The ID is particularly useful if you want to inspect the message itself.

A useful feature for web servers is to enable mail. This will add a header to all outgoing email messages showing the script and user that generated each message. Once enabled this will then add the following extra header to message:. In this example is the UID and the spamEmailer.

This can allow you to quickly track down the source of spam messages being sent by your server. With these commands you should be able to review your mail queue and make sure that intended messages are being sent and have not been rejected.

How to delete mail queue in Postfix

Now that we have learned the necessary steps to reviewing your mail queue, the final 3 tips will demonstrate how to delete queued mail. Delete only the differed mail queue messages i. This is not something that is natively included with the standard Postfix tools however can be done with a bit of Perl scripting. NB: This perl script seems to be free, and is all over the internet however I could not find out where it originates or who wrote it but my thanks go to them!

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postfix deferred

We are looking for an ambitious, goal driven Partner Marketing Manager to continue the growth of our UK partner channel of digital transformation specialists. We are seeking a systems administrator or cloud engineer for our incident response team with hands-on knowledge of Microsoft Azure. Thoughts 5 top tips for reviewing your Postfix mail queue. How to review the email message your server is trying to send. How to delete queued mail from the mail queue Now that we have learned the necessary steps to reviewing your mail queue, the final 3 tips will demonstrate how to delete queued mail.

Similar Posts. See All Posts. Join Us Partner Marketing Manager We are looking for an ambitious, goal driven Partner Marketing Manager to continue the growth of our UK partner channel of digital transformation specialists. Cloud Support Engineer We are seeking a systems administrator or cloud engineer for our incident response team with hands-on knowledge of Microsoft Azure.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

Ask Ubuntu is a question and answer site for Ubuntu users and developers. It only takes a minute to sign up. I'm configuring a new Ubuntu server We use Officeso this allows us to funnel these kinds of messages from equipment and software in-house to our mailboxes. My organization has had this set up very simply with Postfix for a number of years. Unfortunately, the employee who set it up is long gone, and I can't find any documentation as to the specifics.

However, based on some information I've found, it doesn't appear that the configuration needs to be that complex. I have installed Postfix on the new system, and tried to configure it to match the existing config as much as possible. I can get out to the internet from this new server, I can ping resources on the internet, etc.

I keep seeing log entries about the messages being deferred, and connections timing out. Again, I've anonymized the contents:. There's no firewall configured or running on the host itself, and based on my conversations with the network engineer, there should be nothing blocking this traffic. However, from the existing server, I can telnet to the Office mail server name listed in the MX record for my organization, on port 25, and get a response, throw a 'helo' at it, etc.

I cannot do the same from this new server. My network engineer is confident that there's nothing on the firewall that would be blocking the outgoing traffic, and while he's been trying to help me troubleshoot this, he hasn't seen anything that would indicate what's causing it.

I'm not sure what else I could be missing. Any help would be greatly appreciated. In order to configure a SMTP-Relay you have to define a relayhost along with some sasl authentication items.

Obviously you have to change "your. After that you'll have to restart postfix with systemctl restart postfix. I'm not familiar with Office but for relaying via MS Exchange Servers it's quite usual that you have to try different ports.

Ubuntu Community Ask! Sign up to join this community. The best answers are voted up and rise to the top. Home Questions Tags Users Unanswered. Asked 1 year, 10 months ago.

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postfix deferred

CE1B myservername.Some system administrators will want to control the queue lifetime or even how frequently a message in the deferred queue is selected for redelivery. This article contains information for tuning Postfix queue settings to configure both Postfix queue lifetime and Postfix deferred queue parameters. Be sure to also keep a backup of your changed Postfix configuration file, in order to restore your configuration after upgrading or reinstalling.

The default queue lifetime is 5 days. To change the queue lifetime, use the following steps. Type the following command, replacing [time] with the new queue lifetime.

Time can be in seconds sminutes mhours hdays dand weeks w. Note : Since most Postfix daemons are short-lived, your new settings are actually recognized automatically as those daemons expire and new ones are launched. However, longer running daemons such as pickup, qmgr, and possibly trivial-rewrite will not detect changes to main. Changes to master. You must stop and then start Postfix in this case. To ensure that your changes are not overwritten by a future Zimbra upgrade, you can set them in the local config.

Some administrators prefer to more tightly control the way mail in the deferred queue is handled. Type the following command, replacing [parameter] with the parameter you want to reconfigure and replacing [time] with the new time. This will not immediately update the value in Postfix, but will ensure that it is rewritten at the time of the next upgrade. Try Zimbra Collaboration with a day free trial.

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Tuning Postfix Queue Settings.

postfix deferred

Try Zimbra Try Zimbra Collaboration with a day free trial.This document is an introduction to Postfix queue congestion analysis. It explains how the qshape 1 program can help to track down the reason for queue congestion.

This document describes qshape 1 as bundled with Postfix 2. When mail is draining slowly or the queue is unexpectedly large, run qshape 1 as the super-user root to help zero in on the problem. The qshape 1 program displays a tabular view of the Postfix queue contents. On the horizontal axis, it displays the queue age with fine granularity for recent messages and geometrically less fine granularity for older messages.

The vertical axis displays the destination or with the "-s" switch the sender domain. Domains with the most messages are listed first. For example, in the output below we see the top 10 lines of the mostly forged sender domain distribution for captured spam in the " hold" queue :.

The "T" column shows the total in this case sender count for each domain. The columns with numbers above them, show counts for messages aged fewer than that many minutes, but not younger than the age limit for the previous column. In this example, there are 14 messages allegedly from yahoo. When the output is a terminal intermediate results showing the top 20 domains -n option are displayed after every messages -N option and the final output also shows only the top 20 domains.

This makes qshape useful even when the deferred queue is very large and it may otherwise take prohibitively long to read the entire deferred queue. By default, qshape shows statistics for the union of both the incoming and active queues which are the most relevant queues to look at when analyzing performance. Command line options control the number of display "buckets", the age limit for the smallest bucket, display of parent domain counts and so on.

The "-h" option outputs a summary of the available switches. Large numbers in the qshape output represent a large number of messages that are destined to or alleged to come from a particular domain. It should be possible to tell at a glance which domains dominate the queue sender or recipient counts, approximately when a burst of mail started, and when it stopped. The problem destinations or sender domains appear near the top left corner of the output table.

To check whether this limit has been reached, use:. If the total sender count is below the active queue is not yet saturated, any high volume sender domains show near the top of the output.

To check for exhaustion of this limit use:. Having found the high volume domains, it is often useful to search the logs for recent messages pertaining to the domains in question. Also look for queue manager warning messages in the log. These warnings can suggest strategies to reduce congestion. When all else fails try the Postfix mailing list for help, but please don't forget to include the top 10 or 20 lines of qshape 1 output.This document presents an overview of the Postfix architecture, and provides pointers to descriptions of every Postfix command or server program.

The text gives the general context in which each command or server program is used, and provides pointers to documents with specific usage examples and background information. When a message enters the Postfix mail system, the first stop on the inside is the incoming queue. The figure below shows the main processes that are involved with new mail.

Names followed by a number are Postfix commands or server programs, while unnumbered names inside shaded areas represent Postfix queues. Network mail enters Postfix via the smtpd 8 or qmqpd 8 servers. These servers remove the SMTP or QMQP protocol encapsulation, enforce some sanity checks to protect Postfix, and give the sender, recipients and message content to the cleanup 8 server.

Local submissions are received with the Postfix sendmail 1 compatibility command, and are queued in the maildrop queue by the privileged postdrop 1 command. This arrangement even works while the Postfix mail system is not running. The local pickup 8 server picks up local submissions, enforces some sanity checks to protect Postfix, and gives the sender, recipients and message content to the cleanup 8 server. Mail from internal sources is given directly to the cleanup 8 server.

These sources are not shown in the figure, and include: mail that is forwarded by the local 8 delivery agent see next sectionmessages that are returned to the sender by the bounce 8 server see second-next sectionand postmaster notifications about problems with Postfix.

The cleanup 8 server implements the final processing stage before mail is queued.

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The cleanup 8 server places the result as a single file into the incoming queueand notifies the queue manager see next section of the arrival of new mail. The trivial-rewrite 8 server rewrites addresses to the standard "user fully. Postfix currently does not implement a rewriting language, but a lot can be done via table lookups and, if need be, regular expressions. Once a message has reached the incoming queue the next step is to deliver it.

The figure shows the main components of the Postfix mail delivery apparatus. The queue manager the qmgr 8 server process in the figure is the heart of Postfix mail delivery.

It contacts the smtp 8lmtp 8local 8virtual 8pipe 8discard 8 or error 8 delivery agents, and sends a delivery request for one or more recipient addresses. The discard 8 and error 8 delivery agents are special: they discard or bounce all mail, and are not shown in the figure above. The queue manager maintains a small active queue with the messages that it has opened for delivery.

The active queue acts as a limited window on potentially large incoming or deferred queues. The limited active queue prevents the queue manager from running out of memory under heavy load. The queue manager maintains a separate deferred queue for mail that cannot be delivered, so that a large mail backlog will not slow down normal queue accesses.

Additional routing information can be specified with the optional transport 5 table. The trivial-rewrite 8 server optionally queries the relocated 5 table for recipients whose address has changed; mail for such recipients is returned to the sender with an explanation.


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