The Cartweaver 4 default email handling is very user friendly. All you need to know is to follow the steps below.
Go to Admin -> click on site setup -> Click on Email settings.
By default you don't need to change anything and all will work smoothly. There is a link on the top of the page which says: "View Sample Email Format" Clicking on it you can view how the email will be delivered.
However you can do all kinds of changes in the emails setting to your need or requirement. Please have a look on the settings option provided by this section.