I used to use Razor, but eventually world needs preview and WYSIWYG editor. So I switched to handlebars. JS Library can display preview of handlebars template to user before sending email. User can customize template easily. There are various template editors, such as grapesjs.com/demo-newsletter-edito... which has excellent browser editor support. Slowly we are coming out of .NET Core and switching to NodeJS via NodeServices.
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