Great plugin, works nicely however I have a few issues.
It's annoying that this plugin does not comply with the WordPress registration setting.
If I have registrations disabled in settings, a new user should not be created when the user logs in and an account for that email doesn't exist.
Could you please add a setting to disable registration or comply with the WordPress registration setting?
Also an option to remove the 'My Contacts' shortcut would be great.
Also an option to take the user back to previous page upon login.