Everaldo Canuto

Using this plugin you can heve different URL’s for your WordPress frontend and 
backend.
<h4>Credits</h4>
This plugin is created by <a href="https://twitter.com/ecanuto" title="Everaldo Canuto" rel="friend nofollow ugc">Everaldo Canuto</a> with sponsorship from <a href="http://nuveo.com.br/" title="Nuveo" rel="friend nofollow ugc">Nuveo</a>.

WP Domains

Just works

Use different domains for backend (admin) and frontend on Wordpress.

Warren Harrison

The User Domain Whitelist/Blacklist plugin limits user registration to only registrants with an email address from the domain white list below OR prevents registrants with an email address from the domain black list below from registering. For example, hortense@example.com would only be allowed to register if example.com appeared in the domain white list. Conversely, hortense@example.com would not be allowed to register if example.com appeared in the domain black list. Anyone attempting to register using an email address outside the white list or inside te black list will receive the error message below.Anyone attempting to register using an email address outside the white list will receive an error message. Both the domain whitelist and the error message can be modified via the plugin options page (available under the Settings menu).

User Domain Whitelist

The User Domain Whitelist/Blacklist plugin limits user registration to only registrants with an email address from the domain white list provided by t …

WP Domains vs User Domain Whitelist