|> To send emails with a Mars Rover photo, you will need to install Python 3, create a SendGrid account and obtain an API key. You will also need to set up your development environment by installing the necessary dependencies, including Flask and requests. Next, you will create a module called mars_emails.py that interacts with the Mars Rover API and sends responses in an email using the SendGrid API key. This module includes functions such as get_mars_photo, which retrieves a random image from the Mars Rover API, and send_mars_email, which takes the response from get_mars_photo and sends it in an email. You will also need to create a Flask application that receives incoming emails via the SendGrid Inbound Parse webhook. The Flask application will use the mars_emails module to respond to incoming emails with a Mars Rover photo based on the Martian solar day included in the body of the email. To set up the Flask application, you will need to authenticate your domain with Twilio SendGrid and configure the SendGrid Inbound Parse webhook using ngrok. Finally, you can test the application by sending an email with a Martian solar day number as the body, which will invoke the Flask endpoint and send a response with a Mars Rover photo.