This article is in the Control section of the App.
Go to the Control zone by clicking on the right-hand icon in the bottom toolbar, then in the lefthand sidebar, Navigate to Team under the heading Configuration.
From here, simply click on the button for the login which you wish to receive/stop receiving notifications for.
Then scroll down and toggle the Allow Email Notifications switch to either ON or OFF.
Once you have done this, ensure that you click on the button.