The notification sound my Motorola Droid was making every time I received an email message was annoying. I had to change the ringtone. Here’s how it’s done.
1. Open the Email or Gmail application. You may have to do these steps for both applications.
2. In the message list, press the Menu button.
3. Tap Account Settings.
4. Scroll down and tap Select ringtone.
5. Select a sound or select Silent. Then you can tap Vibrate on the previous screen if you like.