In order to configure mail notifications for yourself (merchant) add email address in builder Store properties → Settings tab → Contact Form block. Click “pencil” icon in contact form block and switch to “E-mail settings” tab. Type your email address in field “Form will be sent to this E-mail” where you want to receive mail notifications. You can also configure SMTP options in the “SMTP” tab.
Customers will get mail notifications to email address which they enter in Billing Information block. Note that Billing and shipping blocks can be disabled for customers in Store Cart module. To check if it is not disabled ensure that the option “Require Billing/Shipping Information” is enabled in Store Cart module.
Why do I not receive mail notifications even after adding email address in Store configuration?
Despite you added email address in “Contact Form” block settings there can be cases when mail notifications are not delivered. The usual reason for that is the absence of SPF record of your website domain.
Done !