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SendInBlue is an email service that allows you to send emails from your Node.js application. The SendinBlue email API key is required for sending emails using the SendinBlue method. The sender's email has to be the email account that you have used for the service. The subject is required and you can pass parameters to the email content using the 'textContent` or 'htmlContent' method. If you want me to teach you how to create a newsletter that you can use, please let me know.