Skip to Main Content
Postfix: The Definitive Guide
book

Postfix: The Definitive Guide

by Kyle D. Dent
December 2003
Beginner content levelBeginner
278 pages
10h 47m
English
O'Reilly Media, Inc.
Content preview from Postfix: The Definitive Guide

Chapter 5. Queue Management

The queue manager daemon qmgr is in many ways the heart of your Postfix system.[1] All messages, both outbound and inbound, must pass through the queue. It’s a good idea to understand the queue and how Postfix uses it in case you have to troubleshoot a problem.

The queue manager maintains five different queues: incoming, active, deferred, hold, and corrupt. Postfix uses a separate directory for each queue below the path specified in the queue_directory parameter. By default the path is /var/spool/postfix, which gives you a directory structure like the following:

/var/spool/postfix/active
/var/spool/postfix/bounce
/var/spool/postfix/corrupt
/var/spool/postfix/deferred
/var/spool/postfix/hold

The qmgr daemon running in the background handles most of the queue management tasks automatically. The commands postsuper and postqueue are used by administrators for manual queue management tasks. This chapter looks at how qmgr and the command-line tools work, as well as Postfix parameters that affect the queue.

[1] You may see references to nqmgr in older configuration files and documentation. Earlier Postfix versions shipped with two queue manager daemons, qmgr and nqmgr. The original qmgr was replaced by the current one, which has a better scheduling algorithm. nqmgr was the name of the current queue manager daemon while it coexisted with the original. Once it was ready for promotion as sole queue manager for Postfix, it was renamed qmgr.

Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.
Start your free trial

You might also like

Linux Cookbook, 2nd Edition

Linux Cookbook, 2nd Edition

Carla Schroder
Linux Under the Hood

Linux Under the Hood

Sander van Vugt
Kubernetes: Up and Running, 2nd Edition

Kubernetes: Up and Running, 2nd Edition

Brendan Burns, Joe Beda, Kelsey Hightower

Publisher Resources

ISBN: 0596002122Errata Page