In this webcast of a talk delivered in September 2015 at University of Massachusetts as part of NERD Summit, I talk about how to reach email subscribers on whatever devices, operating systems, or email clients they are using. In the session, I look at some of the challenges of sending responsive HTML emails (e.g., lack of client support for a variety of CSS rules) and how you can apply what you already know about HTML and CSS to overcome them. I also talk about techniques (such as CSS injection) that can make coding your emails much easier. The slides, which contain links to additional articles and resources, can be found here.