Geary is a lightweight email reader for the GNOME desktop

Introducing Geary Version 0.2 includes major new features, including attachments, full HTML composition, and more. We recommend that all users upgrade.
A lightweight email program designed around conversations and built for the GNOME desktop.

Download 0.2 • User Guide • Mailing List • Wiki

Geary

Geary is a new email reader for GNOME designed to let you read your email quickly and effortlessly. Its interface is based on conversations, so you can easily read an entire discussion without having to click from message to message. Geary is still in early development and has limited features today, but we're planning to add lightning-fast searching, multiple account support, and much more. Eventually we'd like Geary to have an extensible plugin architecture so that developers will be able to add all kinds of nifty features in a modular way.
Geary is written in Vala, is designed to integrate with the GNOME desktop and is completely free. It runs on Debian, Fedora, Ubuntu and other free operating systems.
We released Geary 0.2 on October 1, 2012. See our wiki to learn how to download, build and run Geary. For help with frequently asked questions, visit our help documentation. If you're running Ubuntu 12.04 (Precise), you can install Geary directly from the Yorba PPA.