Email Marketing: Preheader testing generates 30% higher newsletter open rate for trade journal

“While the inbox is the first thing a subscriber sees, it’s often the last thing considered when creating an email. The preheader snippets are an extension of your subject line message that you should take advantage of, using the extra space of characters that most email clients make visible.”

Read full article: http://www.marketingexperiments.com/blog/general/preheader-testing-higher-newsletter-opens.html