在Django Rest Framework中注册后，如何自动生成电子邮件？

Question

我有一个A models.py

models.py

class User(AbstractUser, BaseModel):
    full_name = models.CharField(max_length=64)
    addresss=models.CharField(max_length=40)
    phoneno=models.IntegerField(null=True, blank=True)
    email=models.EmailField()
    password=models.CharField(max_length=40)
    re_password=models.CharField(max_length=40)
    gender=models.IntegerField(choices=gender_choice,default='0')

serializers.py

class UserSerializer(serializers.HyperlinkedModelSerializer):

    class Meta:
        model = User
        fields = ('full_name','id','addresss','phoneno','email','gender')

views.py

class StudentViewset(viewsets.ModelViewSet):

    queryset = Student.objects.all()

    serializer_class = StudentSerializer
    http_methods = ['get', 'post','put','delete']


    def create(self, request):
        serializer = self.get_serializer(data=request.data)
        serializer.is_valid(raise_exception=True)

        row = serializer.data

        user=User.objects.get_or_create( 
            defaults={'full_name':row['user']['full_name'],'addresss':row['addresss'],
            'phoneno':row['phoneno'],'password':row['password'] ,'re_password':row[['re_password'],
            'gender':row['gender'] ,'username':username})

我的问题：

注册学生后，我想生成一封类似于他/她的电子邮件（地址@ gmail.com）。

我该怎么做？