That being said, this doesn't just related to email. You can create a shortcut on your desktop to any site you visit frequently. There are several ways, but this is my favorite:
- Go to the desired site.
- Minimize your window (if necessary) to be able to see a little bit of your desktop in the background.
- Drag the icon in front of the URL to your desktop.
- Right-click the icon to rename it if desired.