Hi Robert!
There is a solution that is simpler than the previous one. Just remove the {$a} from the string responsible for displaying the list of allowed domains.
Go to the section Site administration >> Language>> Language customization. On the customization screen, search for the string called emailonlyallowed.
Save your changes.
After that, the list of allowed domains will no longer be displayed during the registration process, preventing malicious users from attempting to manipulate the information.
I hope this helps! We're always here for anything you need. If you need anything, just reach out! 😊
Eduardo Kraus
Innovation and new products