Idea of Open Envelope Icon
When you have email messages available to read you will see a envelope with the top flap open and inside a piece of paper. This shows that you have messages available in your email inbox.
This Open Envelope icon has Android KitKat style
. If you use the icons for Android apps, we recommend using our latest Material Icons icon pack (please check our sidebar on the right). Otherwise, it's a solid icon pack that looks good in small resolutions, either on the web or in print. It's characterized by thick lines, smooth corners, and is optimized for 24x24 pixels.