So what can you write to entice readers to open an email and engage in your content? At OutboundEngine, we craft eye-catching, branded emails on behalf of our customers, and we work hard to ensure high delivery rates that are well above industry averages. After reviewing the emails we sent on behalf of business owners across many different industries in 2016, we've determined which three subject lines for each received the most opens. Here's a list of the top performing email subject lines and their corresponding header images to help you build a solid strategy for 2017.