Mozilla Thunderbird is a very famous mail application, its very cool and faster.

What's new in Thunderbird
The latest version of Thunderbird has the following changes:
Faster to start-up and more responsive.
Thunderbird is based on the new Mozilla Gecko 5 engine.
New Add-on Manager.
Revised account creation wizard to improve email setup.
New information page for Troubleshooting.
Drag different windows and Tabs can now be reorder.
Attachment sizes displayed with attachments.
Plugins can now be loaded in RSS Feeds.
Many fixes for Windows and Mac.

Now Install Thunderbird 5 on Ubuntu/Linux Mint using PPA
Open Terminal (press Alt+F2 and type: gnome-terminal) and copy the following commands in the terminal

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