The number of people using a preview pane to view their email has grown in recent years.  So considering what your readers see in that preview pane has become an increasingly important aspect of planning an email campaign.

The challenge of not knowing whether readers are using a vertical or horizontal preview pane makes the information placed in the upper left region (which will be visible in either layout) of an email vitally important. Combining the viewable area of horizontal and vertical preview panes at common sizes, we find there is a square of overlap that will be visible to most preview pane users.  That’s good news.

As a quick rule of thumb, a square of approximately 4-5 inches (288-360 pixels) is a safe size to plan for this commonly viewable area. This space should be used to quickly establish the brand and primary call to action alongside standard email strategies, such as accounting for image blocking by using HTML text and ALT tags.

Optimizing for the preview pane in this way helps ensure readers will see the most important parts of your message immediately and will engage further by opening your email.

What’s the best way to integrate multi-media and video into my email program?

While support for various HTML and CSS features varies widely across email clients, their stance on video and Flash media in email remains surprisingly unanimous – and that answer is “not supported.”

Only one email client, Mail (Mac), will even display this kind of media at all. Every other client will either strip out the video as if it was never there, or treat it as a blocked image that can never be displayed.

It is possible to introduce a small amount of motion or animation to email with animated .gifs, but even these images aren’t fully supported by some major clients, such as Outlook 2007 (which will only display the first frame of the animation).

With this information in mind, the best way to integrate multi-media content into your email program is not to embed the media in an email, but rather to link to a web-based version that’s hosted outside the email.


Chris Studabaker
Email Campaign Manager