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Я вызываю пользовательскую ошибку проверки в поле электронной почты, которая принимает только yahoo, gmail и outlook. Что я здесь делаю не так?

 from django import forms
from django.contrib.auth.models import User
from django.contrib.auth.forms import UserCreationForm
from .models import Profile, Testimonial

class UserUpdateForm(forms.ModelForm):
  username = forms.CharField()
  first_name = forms.CharField()
  last_name = forms.CharField()
  email = forms.EmailField()

  class Meta:
    model = User
    fields = ['username', 'email', 'first_name', 'last_name']

  def clean_email(self):
    email = self.cleaned_data.get('email')
    email_exists = User.objects.filter(email=email) 
    accepted_domains = ['gmail.com', 'yahoo.com', 'outlook.com', 'hotmail.com'] 
    username = self.cleaned_data.get('username')  
    _, domain = email.split('@')
    if email_exists.exists():     
      raise forms.ValidationError("Email is taken") 
    elif domain.lower() not in accepted_domains:      
      raise forms.ValidationError("Invalid email")
    return email   
 

Вы можете сделать это следующим образом:

 accepted_domains = ['gmail.com', 'yahoo.com', 'outlook.com']

_, domain = email.split('@')
if email_exists.exists() and not self.instance and self.instance.pk==None:
  raise forms.ValidationError("Email is taken") 
if domain.lower() not in accepted_domains:
  raise forms.ValidationError("Email should be gmail, yahoo and outlook only")
return email