Sender Avatars help you find email from important contacts easily. The app allows you to control the size of the avatar to suit your preference. You can even remove them if you prefer. The app comes with avatars enabled. Here's how to set your preferences or disable them:
1.Tap the Nav icon at the top left corner of the Nav Bar to display the Navigation Drawer.
2.Tap the Gear icon at the bottom of the Navigation Drawer to bring up Settings.
4.Tap Sender Avatar under Message List.
5.Select Large, Normal or None by tapping the radio button.