pmdamailq(1) — Linux manual page


PMDAMAILQ(1)             General Commands Manual            PMDAMAILQ(1)

NAME         top

       pmdamailq - mail queue performance metrics domain agent (PMDA)

SYNOPSIS         top

       $PCP_PMDAS_DIR/mailq/pmdamailq [-b binlist] [-d domain] [-l
       logfile] [-r regex] [-U username] [queuedir]

DESCRIPTION         top

       pmdamailq is a Performance Metrics Domain Agent (PMDA) which
       extracts performance metrics describing the state of the e-mail
       queues managed by sendmail(1) and other mail transfer agents.

       The mailq PMDA exports metrics that measure the total number of
       entries in the mail queue, and the subtotals for entries that
       have been queued for various time periods.

       A brief description of the pmdamailq command line options

       -b   The binlist argument specifies a list of delay thresholds
            used to ``bin'' the entries in the queue into a a histogram
            based on how long the entry has been in the mail queue.  The
            default thresholds are: 1 hour, 4 hours, 8 hours, 1 day, 3
            days and 7 days.  The entries in binlist are comma separated
            time intervals, using the syntax described in PCPIntro(1)
            for an update or reporting interval, e.g. the default list
            could be specified using the value

            Values in binlist are assumed to be in ascending order, and
            mail items in the queue less than the first threshold are
            binned into a special bin labeled ``recent''.

       -d   It is absolutely crucial that the performance metrics domain
            number specified here is unique and consistent.  That is,
            domain should be different for every PMDA on the one host,
            and the same domain number should be used for the same PMDA
            on all hosts.

       -l   Location of the log file.  By default, a log file named
            mailq.log is written in the current directory of pmcd(1)
            when pmdamailq is started, i.e.  $PCP_LOG_DIR/pmcd .  If the
            log file cannot be created or is not writable, output is
            written to the standard error instead.

       -r   Use an extended regular expression to match file names in
            the mail queue directory, rather than assuming all "df"
            prefixed files in the directory are mail files (the "df"
            prefix is the sendmail convention, but this convention is
            not followed by other mail daemons).  The regex pattern
            specified should conform to the POSIX format described in
            regex(3), and it describes file names that should be
            considered mail.

       -U   User account under which to run the agent.  The default is
            the unprivileged "pcp" account in current versions of PCP,
            but in older versions the superuser account ("root") was
            used by default.

       The optional queuedir argument defines the directory in which
       pmdamailq expects to find the mail queue.  The default is

INSTALLATION         top

       If you want access to the names, help text and values for the
       mailq performance metrics, do the following as root:

            # cd $PCP_PMDAS_DIR/mailq
            # ./Install

       If you want to undo the installation, do the following as root:

            # cd $PCP_PMDAS_DIR/mailq
            # ./Remove

       pmdamailq is launched by pmcd(1) and should never be executed
       directly.  The Install and Remove scripts notify pmcd(1) when the
       agent is installed or removed.

FILES         top

              command line options used to launch pmdamailq
              default help text file for the mailq metrics
              installation script for the pmdamailq agent
              undo installation script for the pmdamailq agent
              default log file for error messages and other information
              from pmdamailq


       Environment variables with the prefix PCP_ are used to
       parameterize the file and directory names used by PCP.  On each
       installation, the file /etc/pcp.conf contains the local values
       for these variables.  The $PCP_CONF variable may be used to
       specify an alternative configuration file, as described in

SEE ALSO         top

       PCPIntro(1), pmcd(1), pcp.conf(5) and pcp.env(5).

COLOPHON         top

       This page is part of the PCP (Performance Co-Pilot) project.
       Information about the project can be found at 
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       page, send it to  This page was obtained from the
       project's upstream Git repository
       ⟨⟩ on 2024-06-14.
       (At that time, the date of the most recent commit that was found
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       (which is not part of the original manual page), send a mail to

Performance Co-Pilot               PCP                      PMDAMAILQ(1)