pmailq software package provides postfix mail queue manager, you can install in your Ubuntu 14.04 LTS (Trusty Tahr) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install pmailq
pmailq is installed in your system.
Make ensure the pmailq package were installed using the commands given below,
$ sudo dpkg-query -l | grep pmailq *
You will get with pmailq package name, version, architecture and description in a table
| Distro | Ubuntu 14 04 lts trusty tahr |
| Section | Administration Utilities |
| Package | pmailq |
| Version | 0.5-1 |
| Description | postfix mail queue manager |
| Sub Section | Admin |