mailnag software package provides mail notification daemon for GNOME 3, 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 mailnag
mailnag is installed in your system.
Make ensure the mailnag package were installed using the commands given below,
$ sudo dpkg-query -l | grep mailnag *
You will get with mailnag package name, version, architecture and description in a table
| Distro | Ubuntu 14 04 lts trusty tahr |
| Section | GNOME |
| Package | mailnag |
| Version | 0.5.2-2 |
| Description | mail notification daemon for GNOME 3 |
| Sub Section | GNOME |