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postqueue - Postfix queue control
To flush the mail queue:
postqueue [-v] [-c config_dir] -f
postqueue [-v] [-c config_dir] -i queue_id
postqueue [-v] [-c config_dir] -s site
To list the mail queue:
postqueue [-v] [-c config_dir] -j
postqueue [-v] [-c config_dir] -p
The postqueue(1) command implements the Postfix user interface for
queue management. It implements operations that are traditionally
available via the sendmail(1) command. See the postsuper(1) command
for queue operations that require super-user privileges such as delet-
ing a message from the queue or changing the status of a message.
The following options are recognized:
The main.cf configuration file is in the named directory instead
of the default configuration directory. See also the MAIL_CONFIG
environment setting below.
-f Flush the queue: attempt to deliver all queued mail.
This option implements the traditional "sendmail -q" command, by
contacting the Postfix qmgr(8) daemon.
Warning: flushing undeliverable mail frequently will result in
poor delivery performance of all other mail.
Schedule immediate delivery of deferred mail with the specified
This option implements the traditional sendmail -qI command, by
contacting the flush(8) server.
This feature is available with Postfix version 2.4 and later.
-j Produce a queue listing in JSON format, based on output from the
showq(8) daemon. The result is a stream of zero or more JSON
objects, one per queue file. Each object is followed by a new-
line character to support simple streaming parsers. See "JSON
OBJECT FORMAT" below for details.
This feature is available in Postfix 3.1 and later.
-p Produce a traditional sendmail-style queue listing. This option
implements the traditional mailq command, by contacting the
Postfix showq(8) daemon.
Each queue entry shows the queue file ID, message size, arrival
time, sender, and the recipients that still need to be deliv-
ered. If mail could not be delivered upon the last attempt, the
reason for failure is shown. The queue ID string is followed by
an optional status character:
* The message is in the active queue, i.e. the message is
selected for delivery.
! The message is in the hold queue, i.e. no further deliv-
ery attempt will be made until the mail is taken off
Schedule immediate delivery of all mail that is queued for the
named site. A numerical site must be specified as a valid RFC
5321 address literal enclosed in , just like in email
addresses. The site must be eligible for the "fast flush" ser-
vice. See flush(8) for more information about the "fast flush"
This option implements the traditional "sendmail -qRsite" com-
mand, by contacting the Postfix flush(8) daemon.
-v Enable verbose logging for debugging purposes. Multiple -v
options make the software increasingly verbose. As of Postfix
2.3, this option is available for the super-user only.
JSON OBJECT FORMAT
Each JSON object represents one queue file; it is emitted as a single
text line followed by a newline character.
Object members have string values unless indicated otherwise. Programs
should ignore object members that are not listed here; the list of mem-
bers is expected to grow over time.
The name of the queue where the message was found. Note that
the contents of the mail queue may change while it is being
listed; some messages may appear more than once, and some mes-
sages may be missed.
The queue file name. The queue_id may be reused within a Postfix
instance unless "enable_long_queue_ids = true" and time is mono-
tonic. Even then, the queue_id is not expected to be unique
between different Postfix instances. Management tools that
require a unique name should combine the queue_id with the
myhostname setting of the Postfix instance.
The number of seconds since the start of the UNIX epoch.
The number of bytes in the message header and body. This number
does not include message envelope information. It is approxi-
mately equal to the number of bytes that would be transmitted
via SMTP including the <CR><LF> line endings.
sender The envelope sender address.
An array containing zero or more objects with members:
One recipient address.
If present, the reason for delayed delivery. Delayed
recipients may have no delay reason, for example, while
delivery is in progress, or after the system was stopped
before it could record the reason.
This program is designed to run with set-group ID privileges, so that
it can connect to Postfix daemon processes.
RFC 7159 (JSON notation)
Problems are logged to syslogd(8) and to the standard error stream.
Directory with the main.cf file. In order to avoid exploitation
of set-group ID privileges, a non-standard directory is allowed
· The name is listed in the standard main.cf file with the
alternate_config_directories configuration parameter.
· The command is invoked by the super-user.
The following main.cf parameters are especially relevant to this pro-
gram. The text below provides only a parameter summary. See post-
conf(5) for more details including examples.
A list of non-default Postfix configuration directories that may
be specified with "-c config_directory" on the command line, or
via the MAIL_CONFIG environment parameter.
config_directory (see 'postconf -d' output)
The default location of the Postfix main.cf and master.cf con-
command_directory (see 'postconf -d' output)
The location of all postfix administrative commands.
Optional list of destinations that are eligible for per-destina-
tion logfiles with mail that is queued to those destinations.
import_environment (see 'postconf -d' output)
The list of environment parameters that a Postfix process will
import from a non-Postfix parent process.
queue_directory (see 'postconf -d' output)
The location of the Postfix top-level queue directory.
The syslog facility of Postfix logging.
syslog_name (see 'postconf -d' output)
The mail system name that is prepended to the process name in
syslog records, so that "smtpd" becomes, for example, "post-
The time limit for sending a trigger to a Postfix daemon (for
example, the pickup(8) or qmgr(8) daemon).
Available in Postfix version 2.2 and later:
List of users who are authorized to flush the queue.
List of users who are authorized to view the queue.
/var/spool/postfix, mail queue
qmgr(8), queue manager
showq(8), list mail queue
flush(8), fast flush service
sendmail(1), Sendmail-compatible user interface
postsuper(1), privileged queue operations
Use "postconf readme_directory" or "postconf html_directory" to locate
ETRN_README, Postfix ETRN howto
The Secure Mailer license must be distributed with this software.
The postqueue command was introduced with Postfix version 1.1.
IBM T.J. Watson Research
P.O. Box 704
Yorktown Heights, NY 10598, USA
111 8th Avenue
New York, NY 10011, USA