You can adjust your email preferences from your Account Settings under the Notifications tab.
For feedback requests, they can be turned either on or off. For order delivery notifications, you can choose to be emailed when each file is ready, or be emailed once all files in the entire order are complete. Once you've updated your preferences, click Save.
If you would like to opt out of promotional emails, click the Unsubscribe button at the bottom of the promotional email.