How to turn off sound for Email+IM App in Virgin Mobile (Kyocera Loft)?

I have a Kyocera Loft with Virgin Mobile and for some reason, even when I have the volume off in the main menu, when I start up Email+IM the volume turns on by itself. It is really annoying because it will make a sound if I get an e-mail/im alert. How do I turn this off? Thanks
 
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