What I most like about Rejoiner is the shared accountability over results. Many brands spend large sums of money on email marketing software, only for the accountability of results to be on their internal team. With Rejoiner, this is flipped on its head, where the company providing the software shares the responsibility for driving incremental revenue. 
While email is the most mature (that sounds better than “old,” right?) form of digital marketing, there’s no shortage of marketing technology innovation in this area. Both startups and established vendors continue to develop new capabilities for formatting, targeting, sending, and monitoring the impact of email messages, as well as functions like list building, inbox management, video email, deliverability, branding, custom email signatures and more.
Take the email below from Paperless Post, for example. I love the header of this email: It provides a clear CTA that includes a sense of urgency. Then, the subheader asks a question that forces recipients to think to themselves, "Wait, when is Mother's Day again? Did I buy Mom a card?" Below this copy, the simple grid design is both easy to scan and quite visually appealing. Each card picture is a CTA in and of itself -- click on any one of them, and you'll be taken to a purchase page.
Please forgive me if I missed this in some of the comments and replies, but I saw nothing on Infusionsoft or Marketo. I was expecting to see both in your analysis, but nothing was mentioned, save for the remark early on that Active Campaign has rocketed past Infusionsoft in the marketplace. Is it because you consider them outside the “Email Marketing” space which was the subject of your analysis?
According to recent research from Radicati Group, worldwide email volume will reach 207 billion messages this year—more than half of those for business. The typical business user receives well over 100 emails each day. Email marketers are challenged not only to make their messages stand out in that deluge, but also to provide relevant, actionable information to targeted recipients.
Send yourself a test email. Before sending an email to a list of people, send one to yourself. Read over the email carefully and keep an eye out for poor formatting or incorrectly sized pictures. Check the email in multiple browsers and use different devices to see if it works across different platforms. Click all the links within the email and make sure they are working as intended.

He is the co-founder of NP Digital. The Wall Street Journal calls him a top influencer on the web, Forbes says he is one of the top 10 marketers, and Entrepreneur Magazine says he created one of the 100 most brilliant companies. Neil is a New York Times bestselling author and was recognized as a top 100 entrepreneur under the age of 30 by President Obama and a top 100 entrepreneur under the age of 35 by the United Nations.
Effective email marketing campaigns are designed for all devices on which users can read their emails -- desktop, tablet, and smartphone. Email campaigns that are designed for mobile devices are especially important -- a quality known as "responsive design." In fact, 73% of companies today prioritize mobile device optimization when creating email marketing campaigns.
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