It’s a lot easier to make a responsive web than a fully responsive newsletter. Why? Email messages are built on tables and that makes the difference. While most of the common browsers support web responsiveness, email providers don’t work the same way. For example: iPhone native inbox fully support responsiveness while Gmail block it. That’s why you should think about certain elements of your newsletter and design them considering how they look on smartphone screen.
Take a look at infographic below from FreshMail and learn how to design emails that will look stunning on every screen.