This is the final article of a five-part series that covers email marketing essentials. Today we’ll be covering split testing.

This is the fourth article in the series that covers email marketing essentials. Now that you understand all the factors that can affect a campaign’s performance, you’ll need a firm grasp of which key performance indicators to monitor.

In this article, I’m going to cover optimizing your content. That includes everything from messaging and tone, to personalization and linking.