Claws Mail, A Full Featured E-mail and News Reader Client for GNU Linux!

Claws Mail is an advanced e-mail client + a newsreader, 2 in 1 :) utility for GNU Linux. It is already fully equipped with features but if you want more then you can use the built it plugin support, also supports themes as well.

Main features...

*. Easily search and filter messages.

*. High secure tunneling (GPG, SSL, anti-phishing).

*. Supports a lot of other e-mail client messages export/import.

*. Support and X-Face to Face.

*. Fully featured tool-bar.

*. Highly stable and loads pretty fast. 

So, if you use Ubuntu you can install Claws Mail 3.7.9 by entering the below command.

sudo apt-add-repository ppa:claws-mail/ppa
sudo apt-get update
sudo apt-get install claws-mail claws-mail-extra-plugins

That's it.