To set your ringer to silent for notificaiton upon email, do the following:
1. Press the Menu key.
2. Press Sounds
3. Scroll down and select Set Ring Tones/Alerts
4. Click on Messages to expand.
5. Click on the email account to change (if you have more than one)
6. On Volume: select Silent and Vibration: Off and Notify Me During Calls: NO
7. Press the Menu key and select Save
8. Press the Red End Call key...thats it.
Hope this helps