Send email task with embed HTML view

Send email task with embed HTML view

Hi,
 
I create a html view in Creator.
I would like to embed this html view in message field of sendmail task.
The embed url is a Functional-based URL.
I try to put iFrame code in the message field, and the html can display in the message box, however, after send the email to my mailbox, I can't see it in Gmail or Outlook.
How can I embed the html view in sendmail task?
 
The url look like this
https://creator.zoho.com/123/salesforce/view-embed/Enhtml/JjZSkMMXHUVmSwWjvHRNf6n6/code=123
 
Thank you.