Allow/Restrict new registrations to one (or more) email domains, e.g. @example.org

How to use GitHub

• Please use the 👍 reaction to show that you are interested into the same feature.
• Please don't comment if you have no relevant information to add. It's just extra noise for everyone subscribed to this issue.
• Subscribe to receive notifications on status change and new comments.

Feature request

Which Nextcloud Version are you currently using: (see administration page)

NC 31.0.8

Is your feature request related to a problem? Please describe.
A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]

In an important way yes. I need to restrict new registrations to users with an email address from their non-profit organization.

Describe the solution you'd like
A clear and concise description of what you want to happen.

As I mentioned above I need/want to allow new registrations to users with a particular email domain, e.g. @domain.org. This feature was in prior Nextcloud installations available and that's a feature that was very important to my service.

Describe alternatives you've considered
A clear and concise description of any alternative solutions or features you've considered.

Restriction to certain IP address is not feasible option for me, and honestly does not make a lot of sense to me. Also, manually entering/registering users is time consuming and not really a good solution, good practice.

Additional context
Add any other context or screenshots about the feature request here.

Please seriously consider adding this option, as I said, it used to be available and worked very well for my Nextcloud operation/services.

Thank you kindly, Robert Cates

The issue names no files, tests, or entry points. Start by reviewing the registration app's signup flow and configuration options, then clarify whether one or multiple domains must be allowed or blocked and how invalid addresses should be handled. Done means new registrations consistently enforce the selected domain policy, with tests covering the supported cases.