Guest portal sponsored authentication

Hi all.
I just tried “sponsored authentication” for guest portal in new “cnMaestro” 4.0.1.
I have a question for you: is it possible to enable a list of sponsor’s e-mails instead entire e-mail domain?

Thanks in advance.

I did put list of emails but when you try it, you will realise that the guest user needs to put sponsor’s email address ( single person) as well as their email address to send emails and get approved.

So I found this very useless.