Email marketing is an industry that survives based on the ability to measure the effectiveness of email campaigns.  This is accomplished through some technical wizardry that leverages two primary features of HTML-based email : images and hyperlinks.  In order to track if/when an individual email recipient actually opened the email campaign, the recipient’s email client must display images.  Unfortunately, having images enabled in your email client can result in embarrassing situations such as opening what looks like a legitimate email in a business meeting only to find that it is a spam containing pornographic images.  As a result, more and more email client programs (Outlook 2007, Gmail, AOL, Windows Live Mail) come with images disabled by default.  As more email client programs adopt this default setting, email marketers will see fewer and fewer “opens” in their campaign analytics and may even misinterpret the trend as a reflection of their campaign quality when it is simply a byproduct of technical evolution.

It’s all Relative

Does this mean that email marketers should ignore the open-rate statistic when evaluating their campaign performance?  No, but it does mean that the open-rate is only meaningful as a relative measurement of whether your email was compelling enough for people to open.  For example, it’s valid when doing A/B testing to compare whether email subject A or email subject B was more compelling (but, of course, only if the segmentation of groups A & B is completely random).  But it is not valid as a measurement of this year’s total email open-rates versus last year’s.

Nurturing Gone Awry

Another dangerous practice is using “email open” events as conditions inside of your lead nurturing programs (in LoopFuse we refer to these as leadflows).  I have had two new LoopFuse customers propose leadflows which take different paths depending on whether the recipient actually opens a particular email.  However, if the recipient has images disabled there is simply no way for the leadflow to determine the correct path.  This can create a confusing or even frustrating experience for their prospects as a result.  If you want to react to a prospect’s email interactions, a click-through is much more reliable.

In an era of analytics overload, it’s understand exactly what the data is telling you, not just what it says.