@Bubka3 and @giorgino this add-on is based on my experience running forums that I'm simply and freely sharing with others. As you've seen the process to remove any domain or country that's been added is a very simple thing to do. Feel free to customize these settings to your own liking.
@HWS - thanks for the tip and I will certainly give that a shoot on the next update. Very much appreciated!
I don't know why but even after using this addon (by importing the .sql into xf_ban_email), I'm still getting users trying to join with teleworm.us, superrito and dayrep.. all of which are there in the sql file.
The banned emails regexs are also visible in the ACP -> Users -> Banned Email Addresses