You can define the content used in your website email using:
System Email Templates – these are used for system-automated email in NetSuite and can also be used for website email. For websites created with 2018.2 or later, system email templates are the default option for website email.
If you have the Multi-Language feature enabled, you can set up multiple language versions of the same email template. Web store users receive the email message in their preferred language. See System Email Templates for Web Stores.
Web Store Email Templates – these are available for website emails only. If you have the Multi-Language feature enabled, you must create separate email templates for each supported language. See Web Store Email Templates.
Customized Text Groups – If you choose not to use system email templates or web store email templates, all the content used in email messages comes from the Email subtab on the Customize Web Site Text page at Setup > SuiteCommerce Advanced > Customize Text. For more information, see the help topic Customizing Web Store Email Messages.