You should be able to change your email notifications as follows:
In our iPad, iPhone and Android apps
In the Menu (or "More" page) tap "Settings," then "Sharing & Privacy," then "Email Settings."
Tap the "✓" icon when you are done
On the Web
Log into your account on our website. Mobile app users should log in using the same email address and password they use in the app.
Once you've logged in, click "My Home", then "Settings", then "Change email address/email preferences". On that page, you can opt in or out of various notification emails and select "Save Changes" at the bottom.
Please note: It can take up to 72 hours for any outbound email changes to take effect.