The team developing Extension:Newsletter would like to have it enabled in mediawiki.org as soon as we complete its security review. We think it will be useful for mediawiki.org users willing to create or subscribe to newsletters. This extension can be tested in the Beta cluster and in its own instance in Labs.
The Newsletter extension project started a year ago as a Google Summer of Code project. The prototype was successfully completed by @Tinaj1234 during her internship. Since then, she has continued working in the project together with other volunteers, mainly @01tonythomas, @Glaisher, @Addshore, and @Parent5446.