How to Allow Specific Emails During Registration

[MikuruX]

I need help with this small problem. I understand that IPB allows you to block certain email addresses that users can use during registration but is there a way to do the opposite and set IPB only to allow certain email addresses to be used while blocking everything else?

 

Basically, I just want to allow up to about 7 or 8 email addresses to be used to register on my site and block everything else.