Responsive email newsletters

Optimizing Your Email for Mobile Devices With the Media Query
Wide emails often require horizontal scrolling, especially when there’s a large image. This case study by Campaign Monitor explains how emails can be optimized for mobile devices using media queries and offers a couple of useful techniques and snippets to be used right away.

Responsive Design for Email, the Largest Mobile Audience
Another interesting case study that shows how the development team behind Beanstalk applied screen-size-specific media queries to target styles, and what design decisions were made to make the mobile email experience better.

Media Queries in HTML Emails
This article covers using media queries to target specific mobile email clients.

Guide to CSS Support in Email
Designing an HTML email that renders consistently across major email clients can be time-consuming. Support for even simple CSS varies considerably between clients, and even different versions of the same client. Campaign Monitor has put together a guide to save you the time and frustration of figuring it out for yourself. With 24 different email clients tested, it covers all of the popular applications across desktop, Web and mobile email.