use 'npm run dev' to start your node server.
Add your own Postgresql and Email configuration in the newsletterConfig.js file. Add your scheduled time in cron format, if you do not know the format refer: https://cloud.google.com/scheduler/docs/configuring/cron-job-schedules
Important note: while adding an email password in the config file, use app specific password generated from the email provider instead of a standard password