asmail software package provides AfterStep mail monitor, you can install in your Ubuntu 16.04 LTS (Xenial Xerus) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install asmail
asmail is installed in your system.
Make ensure the asmail package were installed using the commands given below,
$ sudo dpkg-query -l | grep asmail *
You will get with asmail package name, version, architecture and description in a table
| Distro | Ubuntu 16 04 lts xenial xerus |
| Section | |
| Package | asmail |
| Version | 2.1-4 |
| Description | AfterStep mail monitor |
| Sub Section |