If you have a newsletter that adjusts to display the newsletter slightly differently between desktop, tablet and mobile devices, this is a responsive newsletter.

Important: Be aware that not all devices and email programs will display a newsletter "responsively."

If you are having issues with your newsletter appearing on readers' devices, providing the operating system / device and email client / program will help us recreate your issue. Knowing is half the battle.

For responsive-display issues with your newsletters, please note below which email programs and device operating systems support responsive newsletters. As other programs / devices begin to support responsive elements for newsletters, we'll update this list.