In my opinion, a successful layout for a high performing email should look something as the following:
1. It should have a nice little greeting which shouldn’t sound like too formal
2. A catchy or appealing subject line (still it should clear your business goal)
3. A straight forward and clear message for the reader so that he knows why he’s reading and what’s the main purpose of sending this email
4. An attractive and right CTA
5. Also it should include any relatable image or video to support your main content of the mail
6. A sweet thank you message for your receiver so that he will know that you value their time and effort which they are putting in opening and reading your mail