An HTML email is nothing but a web page that is optimized and prepared for the inbox. If you can code your own web page you can code your own HTML email templates. Not an expert coder? No worries. Most email marketing services provide you with built-in templates that you can use instead.SimplyCast actually gives you access to a Simple Editor that you can use to create as many HTML emails as you want, without knowing how to code. It is designed to be easy to use, with a drag and drop interface.
When designing HTML emails, the editor is your main tool for creation.