A list of self-hosted newsletter applications.
See also list of List of commercial email newsletter services.
Mailcoach looks great on the surface and seems to have a lot of avanced features. Haven’t tested it yet. Runs PHP so can be installed anywhere. https://mailcoach.app/
Sendy is an oldy, but goody. Very stable, but rather outdated and clunky interface. Runs PHP+MySQL. Sends through AWS SES. https://sendy.co/. Recommended to me by Dan Powers at Rectangle Studios (https://rectangle.design/)
Listmonk ‘Self-hosted newsletter & mailing list manager’ https://listmonk.app/ (Via harry lachenmeyer