Level 1 = like an emergency message
Messages = emails
Messenger Alert = BlackBerry Pin Message, from an ongoing conversation
Messenger New Message = New message from a contact, not an additional message in an existing conversation...
Messenger is BlackBerry Messenger, not email messages.
At your VZW BIS site under filters, where you created your email setup to your BB, you can determine which email address you want to make Level 1 Messages.