Thanks for the response.
It’s already set to “Use HTML content type”, and HTML tags used within <body> section like p, li, br, strong etc are working fine.
My question is, “Does HTML tags like head, body and style work in the message body?”
Because I have created HTML code that is using CSS to make my email responsive for multiple screen resolutions.
Let me know how can I achieve this.
PS – I’ve already implemented such responsive emails in raw PHP files using “mail” function successfully.