We are getting spam via HyperKitty

Hi, We are getting spam through. They are gmail addresses entering via HyperKitty (3 today). Example attached, on factory@lists.opensuse.org I suggest to remove the web interface on HyperKitty, or remove the permit to identify via gmail, or put it under moderation (I did the later on the users-es@lists.opensuse.org mail list).