I will say that the way my Droid Inc handled email was far more elegant than my RZR MAXX. I had this same issue and it took several calls to VZN to get it resolved so I belive this is the correct solution.
You may notice that you get these texts when you receive an email (or multiple emails). Also notice the text has a number in it (1.2.3..) - this indicates how many emails were received when the Sync Manager sent the notification. So, VZWNMN:1 = 1 email, VZWNMN:2 = 2 emails and so on... FYI, my texts were (6250:20) and more since I get a lot of email!
You need to take care when removing this service from the VZN website since it can also have the unwated effect of disabling the email account you are editing if you do it incorrectly.
1. Login to your VZN account from a computer - it is much easier to deal with (belive me!)
2. From the main page chose the widget under Device That says "Manage Contacts"
3. Click on Settings (on the right side of the screen)
4.Now chose Sync Points
5. Uncheck
Sync email in real-time throughout the day
Sync email when I sign in to Backup Assistant Plus
6. Click on Inbox and uncheck Message AlertsAlert me with popup when new message arrives