In the "Newsletter" MediaWiki extension We use
"AvailableRights": [ "newsletter-create", "newsletter-delete", "newsletter-manage" ],
Understand what these three rights mean and then explain how to add these rights on our wiki page https://www.mediawiki.org/wiki/Extension:Newsletter
We need something like https://www.mediawiki.org/wiki/Extension:AbuseFilter#User_rights