Is it possible to limit creating invites to only admin and mods?

Is there a possibility (as an configuration option for an admin) to prevent / forbid normal users to invite other users?
Use case: we use the discourse instance only for closed mailing list like discussions. Thus only the admin and moderators shall be able to invite new users.

Yes. If you want it to be full private so people cant view anything unless they have an accountyou can enable invite only. If you want people to be able to view stuff but only allow mods/admins to invite you can change min trust level to allow invite to TL4. Unforently you cant set it to mod or admin but all TL4s are manually promoted by a mod or admin