Introduction

In the previous chapter, we worked on validating APIs using marshmallow. In this chapter, we will add functionality to our application that allows us to send emails to users.

Everyone has their own email address. Some people may even have multiple mailboxes for different needs. In order to ensure the correctness of the email addresses entered by users when creating an account in our application, we need to verify their email address during registration. It is important to get their email address correct, as we may need to send emails to users in the future.

In this chapter, we will implement a function to verify a mailbox, learn how to send a message through the third-party Mailgun API, and create a unique token to ensure that it is verified by the user. This can be achieved with the itsdangerous package. At the end of the chapter, we will make our confidential information (for example, Mailgun API Secret Key) more secure by sorting it into environmental variables...