In the top menu, click on Your user.

Select My profile.

Enter the Preferences section.

Go to the Notification Preferences section.
From this section, you can turn on or off email notifications for the following events:
Withdrawals
When a withdrawal is processed.
Orders received
When you receive a new order.
Money sent
When you send money.
Money received
When you receive money.
Request sent
When you send a payment request.
Request received
When you receive a payment request.