Check mailq


Checks the mail queue. Tested with Postfix and Exim.


  • Exim: By default, exim -bq (alias mailq) can be used only by an admin user. However, the queue_list_requires_admin option can be set false to allow any user to see the queue. Alternatively, add the icinga user to the exim group (sometimes the group is also called Debian-exim).

Fact Sheet

Check Plugin Download

Check Interval Recommendation

Every 5 minutes

Can be called without parameters


Compiled for



command-line tool mailq


usage: mailq [-h] [-V] [--always-ok] [-c CRIT] [--test TEST] [-w WARN]

Checks the mail queue.

optional arguments:
  -h, --help            show this help message and exit
  -V, --version         show program's version number and exit
  --always-ok           Always returns OK.
  -c CRIT, --critical CRIT
                        Set the critical threshold for mails in the queue.
                        Default: 250
  --test TEST           For unit tests. Needs "path-to-stdout-file,path-to-
  -w WARN, --warning WARN
                        Set the warning threshold for mails in the queue.
                        Default: 2

Usage Examples

./mailq --warning 2 --critical 250


4 mails to deliver.


  • WARN on error messages from mailq.

  • WARN or CRIT if number of messages is greater than or equal to the thresholds.

Perfdata / Metrics

  • mailq: Mails in mail queue

Credits, License