Similar module - co-maintaining and merging?

Yeah would absolutely make sense. Maybe just deprecate https://www.drupal.org/project/user_account_emails → and add a link to this module?

Thanks for the notice.
Since this module has more usage and already has some releases, I think it would make sense to deprecate your module, and provide its extra functionalities in this module. I'd be happy to review merge requests to get extra functionality in.