**Secure Invites**
„http://wordpress.org/extend/plugins/wordpress-mu-secure-invites/“:http://wordpress.org/extend/plugins/wordpress-mu-secure-invites/
„http://www.stillbreathing.co.uk/wordpress/wordpress-mu-secure-invites/“:http://www.stillbreathing.co.uk/wordpress/wordpress-mu-secure-invites/
This plugin stops access to your signup page, except where the visitor has been invited and clicked the link in their invitation email. Your users invite people, and you can see who has sent the most invitations, and how many resulting signups have occurred.
* Restrict the ability to invite people to users who have been registered only for a certain number of days or more
* View the number of invites sent and resulting signups per month
* View the users who have sent the most invites, and the number of resulting signups
* Browse all invitations sent (auto paginated)
* Change the default email text
* Set after how many days an invitation will expire
* Works with different locations of signup page (default: /wp-signup.php)
* Set the message to show if someone tries to sign up with no valid invitation
* Turn off security on signup form, allowing anyone to sign up (this does not affect the ability to invite people)
* Introducer points system
