I'm very excited about this project as I'm really happy about the end result. As most of you can certainly understand by looking at the full size previews, this is an Email App with a huge focus on usability while keeping minimalistic aesthetics. This should reduce users learning curve, and at the same time provide a lightweight environment (bandwidth).
The App should be very adaptive to screen resolutions as the 4 main columns (Sidebar, Inbox, Email View (only appears when an email is selected) and Chat are all horizontally and vertically flexible. So it could easily be seen on smaller resolutions.
For best results while viewing the preview, open it on a 1080p monitor or TV, in Full View mode. Also, make sure you check out @2x preview.
I had as main inspiration sources Gmail, Outlook and Facebook, UI.