docs: def post(self, request, key):
          """Create new email address that will wait for validation"""
  
          email = request.POST.get('email')
          user_id = request.POST.get('user')
          if not email:
              return http.HttpResponseBadRequest()
  
          try:
              EmailAddressValidation.objects.create(address=email,
                                                    user_id=user_id)
          except IntegrityError:
              # 409 Conflict
              #   duplicated entries
              #   email exist and it's waiting for validation
              return http.HttpResponse(status=409)
  
          return http.HttpResponse(status=201)