Django-registration, force unique e-mail
For unique e-mail addresses in django-registration-redux 1.4.
In url.py add following
from registration.forms import RegistrationFormUniqueEmail

from registration.backends.default.views import RegistrationView

urlpatterns = [
 url(r'^accounts/register/$',RegistrationView.as_view(form_class=RegistrationFormUniqueEmail),
        name='registration_register'),

 url(r'^accounts/', include('registration.backends.default.urls'))

]
Can I force users to make unique e-mail addresses in django-registration?