I'm a professional newsletter designer and developer. I have created 100+ Newsletter Template that's why I've multi ideas about design & I believe it is important to make your Newsletter visually appealing. I'm able to confidently create professional, eye-catching and stunning email template/ newsletter to help you to market your business.
Importance of responsiveness:
20% of email recipient's are from Mobile and 30% are from Tab. So if you do not consider responsiveness then a large amount of your recipient's will get your email with broken layout.