No matter how effective the subject line you’ll always have subscribers who don’t open it for a variety of reasons. Send your email again specifically targeting a list segment of those who didn’t open the first time around. Not only is this a second chance in case they just missed the first email, it’s another opportunity to further split test subject lines as well as send times.
While this is obviously more of a guideline than a hard-fast rule, if nothing else it should show you where your efforts need to be placed when undertaking a direct mail marketing campaign. Too often, business owners will spend an inordinate amount of time on coming up with the flashiest, snazziest, most eye-catching design that they are sure will blow everyone away, and then rush to put together the offer and/or the list of folks to send it to. It’s one of the most common mistakes of a mail marketing campaign.
Every week, the folks at InVision send a roundup of their best blog content, their favorite design links from the week, and a new opportunity to win a free t-shirt. (Seriously. They give away a new design every week.) They also sometimes have fun survey questions where they crowdsource for their blog. This week's, for example, asked subscribers what they would do if the internet didn't exist.
Julie Ewald recommends moving away from sending generic content to your whole email list via e-blast entirely. With a little elbow grease, you can utilize segmentation and start sending off tailored messages to each of your lists with content that’s relevant, valuable, and designed to resonate with the kind of recipients that make up each segment.