Track the effectiveness through analytics. Most email service providers include free analytics when you use their programs. These analytics provide a great deal of information about the email’s effectiveness, but the three most important metrics are the open rate, click through rate (CTR), and unsubscribes. Knowing this information can help you tweak your content for more successful email marketing in the future.
¿Cuáles son los servidores de correo más usados en la actualidad?
Here's another great example from Litmus of animation being used to create more interesting email marketing design. Unlike static text, the swipe motion used to provide recipients with a look "under the hood" of their email tool is eye-catching and encourages you to take a deeper dive into the rest of the content. Not to mention the header does an excellent job of explicitly stating what this email is about.