The Groups IO service, which is like a google groups alternative that runs popular mailing lists, such as the NVDA mailing list, is developing an app that will interface with the service so users won't have to use the site to manage members or manage their group via email commands.
Until recently, the beta app wasn't accessible. That's changing.
The link below is the Test Flight link. Feedback should be limited to the app development group.
Here's a page on the service itself. It's a Google Groups alternative.
Or send an email to email@example.com