- Download the Plugin.
- unzip it and upload wp-restrict-email-domains to wp-content/plugins.
- Login to Dashboard.
- Visit Dashboard->Plugins->Installed or Dashboard->NetworkAdmin->Plugins->Installed(If you are using multisite) and activate the “WordPress Restrict Email Domains”.
- Please Visit Dasboard->Settings->Restrict Email Domains and include the domains/emails/extensions you want to allow.
- that's it.
Alternatively, you can use the WordPress plugin installer to upload and Install the plugin.