I would like to limit access to a new site of mine to some 150 potential users. I have the email addresses of each of them. Is there a plug-in of any sort that will allow only people providing a particular email address off a list to proceed further into the site?
I know that I can limit access to particular IP addresses through modifying the .htaccess file. But this isn't the same thing as email addresses.
I'd appreciate any pieces of advice here! Thanks!