Just discovered Geary, a simple and beautiful email client for linux. Still in its early days but I think it has a great potential.

Install it by running the following two commands

sudo add-apt-repository ppa:yorba/ppa
sudo apt-get update && sudo apt-get install geary

Shortcuts

[Ctrl+E] - Access Prefernces
[Ctrl+M] - Access Accounts

Works well with multiple Google Apps accounts. It would be nice to be able to hide the top bar and just use shortcuts.