To configure a newsletter for your blog, the traditional way was to:

1. Sign up for a newsletter service like Mailchimp or brevo.
2. Create a new campaign and design your email template.
3. Add your subscribers to the list.
4. Schedule your emails to be sent at regular intervals.
5. Monitor the performance of your campaigns and make adjustments as needed.
6. Monitor delivery rates.
7. Pay heavy money for the service 10s of compliance + extras.
8. Pay someone or manage your own mailing list.

The New way:

One can say the newsy way is to utilize github as a platform to manage your newsletter. For more information, see newsy

kindly read the docs