Notion is a useful tool for project management and note taking, but it also allows users to send emails by creating email templates and an email mailing list. To do this, you can use Python and SendGrid to create a console program that sends out emails with the specified template and database. The application requires a Notion account, a SendGrid account, and two or more email addresses to test it. The user needs to set up their project environment by creating a virtual environment, installing necessary packages, and storing sensitive information in a secure location. Then, you need to obtain an API key from SendGrid, create a verified sender, and set up Notion integrations. Finally, you can use the application to send out emails with the specified template and database. The completed code includes all the steps and uses argument parsing to specify which email template and database to use. To run the application, you need to activate the virtual environment and type a command in the command prompt with the required arguments.