Project one: https://www.bezkoder.com/node-js-express-sequelize-mysql/
Project two: myself
Project three: https://unclebigbay.com/build-an-email-application-using-node-js-express-js-with-gmail-and-nodemailer-all-in-one-article
Project four: https://www.twilio.com/blog/email-newsletter-application-express-node-js-sendgrid