In this chapter, we have, of course, learned things related to email marketing! We learned how we can design a scalable email sender, which can send a huge number of emails.

We also looked at email tracking and figured out a way to track the emails that we send. We wrote the code to extract the tracking information, such as device, location, open rate, and so on. We then integrated the Cosmos DB MongoDB API to store that tracking information.

In the next chapter, we are going to learn more about the deployment part of the Cosmos DB and the best practices for developing a Cosmos DB application.