Allow Duplicate Email
This is not ideal for example where club members are children and they should be registered with a parent's address. It also makes creating test users more difficult as they all need to have separate addresses.
This system plugin allows administrators of Joomla sites to enable users to register more than one account with the same email address. It works by overriding a core class to disable the duplicate email check.
The plugin also uses the Joomla Update feature to check for new versions and enable simple updates when new Joomla versions are released
Currently supported Joomla versions: 2.5, 3.3