In today's world and even more so in tomorrow's world, you are seeing more and more email enabled devices. People are connected and synced to their emails wherever they go. Here are some basic statistics, in 2011.

78% of the North America's population uses the internet. There are over 165 Million Email Users in the United States. Over 72 million people in the US access their email with mobile devices.

These numbers are growing rapidly all over the world, which makes it very important to understand the challenges involved when sending emails to these devices.

Things To Pay Attention To:

Screen Width - Many Devices normally have limited real estate. When designing emails, it shouldn't be cluttered, it should fit without scrolling left and right, and it should have a nice clean presentation. If the person receiveing the email has to do work by zooming in and scrolling left and right to read your email, advertisements, newsletter, etc. You didn't design it properly. Take a step back and re-focus on making the design simple.

Navigation - Devices usually have different types of navigation, a trackball, a keyboard, or a finger. More and more mobile devices are incorporating touch screens in their designs. It's very important that your email is easy to navigate, if you imbed links and images to click on. A person who uses thier finger to click on those links and graphical buttons would have a a hard time pressing them accurately, if they are spaced to close to one another.

Color Depth - Devices vary in color and resolution. One of the most common business oriented devices is a blackberry, the color depth on some models is very poor and can't display rich graphics. Some devices are simply black and white like the popular Amazon Kindle. So when choosing colors in your email, make sure they contrast well when rendered in black and white, so they are easily readable on all devices.

Source: Unlock The Inbox