post-el software package provides emacs major mode for editing mail, 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 post-el
post-el is installed in your system.
Make ensure the post-el package were installed using the commands given below,
$ sudo dpkg-query -l | grep post-el *
You will get with post-el package name, version, architecture and description in a table
| Distro | Ubuntu 14 04 lts trusty tahr |
| Section | |
| Package | post-el |
| Version | 1:2.5-2 |
| Description | emacs major mode for editing mail |
| Sub Section |