n00bs on Ubuntu shows you how to install Claws Mail on Ubuntu 11.04

Claws Mail is an email client aiming at being fast, easy-to-use and powerful. It is mostly desktop-independent, but tries to integrate with your desktop as best as possible. The Claws Mail developers try hard to keep it lightweight, so that it should be usable on low-end computers without much memory or CPU power.

  Install Claws Mail On Ubuntu 11.04