Django doesn't email reporting an internal server error (HTTP status code 500)

Please help! The question are also posted here

http://stackoverflow.com/questions/41363888/django-doesnt-email-reporting-an-internal-server-error-http-status-code-500

I could send mail using the following code

E:\Python\django-test\LYYDownloaderServer>python manage.py shell    Python 3.5.2 (v3.5.2:4def2a2901a5, Jun 25 2016, 22:01:18) [MSC v.1900 32 bit (In  tel)] on win32  Type "help", "copyright", "credits" or "license" for more information.  (InteractiveConsole)  >>> from django.core.mail import send_mail  >>>  >>> send_mail(  ...     'Subject here',  ...     'Here is the message.',  ...     'redstone-cold@163.com',  ...     ['2281570025@qq.com'],  ...     fail_silently=False,  ... )  1  >>> 

According to the doc:

When DEBUG is False, Django will email the users listed in the ADMINS setting whenever your code raises an unhandled exception and results in an internal server error (HTTP status code 500). This gives the administrators immediate notification of any errors. The ADMINS will get a description of the error, a complete Python traceback, and details about the HTTP request that caused the error.

but in my case, Django doesn't email reporting an internal server error (HTTP status code 500) 

what's the problem? please help fix the problem

settings.py

"""  Django settings for LYYDownloaderServer project.    Generated by 'django-admin startproject' using Django 1.9.1.    For more information on this file, see  https://docs.djangoproject.com/en/1.9/topics/settings/    For the full list of settings and their values, see  https://docs.djangoproject.com/en/1.9/ref/settings/  """    import os  ADMINS = [('Philip', 'r234327894@163.com'), ('Philip2', '768799875@qq.com')]  EMAIL_HOST = 'smtp.163.com'  # 'localhost'#'smtp.139.com'  # EMAIL_PORT = 25  # EMAIL_USE_TLS = True    EMAIL_HOST_USER = 'r234327894@163.com'  # '13529123633@139.com'  EMAIL_HOST_PASSWORD = '******'  # DEFAULT_FROM_EMAIL = 'r234327894@163.com'  # Build paths inside the project like this: os.path.join(BASE_DIR, ...)  BASE_DIR = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))      # Quick-start development settings - unsuitable for production  # See https://docs.djangoproject.com/en/1.9/howto/deployment/checklist/    # SECURITY WARNING: keep the secret key used in production secret!  SECRET_KEY = 's4(z8qzt$=x(2t(ok5bb58_!u==+x97t0vpa=*8bb_68baekkh'    # SECURITY WARNING: don't run with debug turned on in production!  DEBUG = False    ALLOWED_HOSTS = ['127.0.0.1']#, '.0letter.com'      # Application definition    INSTALLED_APPS = [      'VideoParser.apps.VideoparserConfig',      'FileHost.apps.FilehostConfig',      'django.contrib.admin',      'django.contrib.auth',      'django.contrib.contenttypes',      'django.contrib.sessions',      'django.contrib.messages',      'django.contrib.staticfiles',  ]    MIDDLEWARE_CLASSES = [      'django.middleware.common.BrokenLinkEmailsMiddleware',      'django.middleware.security.SecurityMiddleware',      'django.contrib.sessions.middleware.SessionMiddleware',      'django.middleware.common.CommonMiddleware',      'django.middleware.csrf.CsrfViewMiddleware',      'django.contrib.auth.middleware.AuthenticationMiddleware',      'django.contrib.auth.middleware.SessionAuthenticationMiddleware',      'django.contrib.messages.middleware.MessageMiddleware',      'django.middleware.clickjacking.XFrameOptionsMiddleware',  ]    ROOT_URLCONF = 'LYYDownloaderServer.urls'    TEMPLATES = [      {          'BACKEND': 'django.template.backends.django.DjangoTemplates',          'DIRS': [],          'APP_DIRS': True,          'OPTIONS': {              'context_processors': [                  'django.template.context_processors.debug',                  'django.template.context_processors.request',                  'django.contrib.auth.context_processors.auth',                  'django.contrib.messages.context_processors.messages',              ],          },      },  ]    WSGI_APPLICATION = 'LYYDownloaderServer.wsgi.application'      # Database  # https://docs.djangoproject.com/en/1.9/ref/settings/#databases    DATABASES = {      'default': {          'ENGINE': 'django.db.backends.sqlite3',          'NAME': os.path.join(BASE_DIR, 'db.sqlite3'),      }  }      # Password validation  # https://docs.djangoproject.com/en/1.9/ref/settings/#auth-password-validators    AUTH_PASSWORD_VALIDATORS = [      {          'NAME': 'django.contrib.auth.password_validation.UserAttributeSimilarityValidator',      },      {          'NAME': 'django.contrib.auth.password_validation.MinimumLengthValidator',      },      {          'NAME': 'django.contrib.auth.password_validation.CommonPasswordValidator',      },      {          'NAME': 'django.contrib.auth.password_validation.NumericPasswordValidator',      },  ]      # Internationalization  # https://docs.djangoproject.com/en/1.9/topics/i18n/    LANGUAGE_CODE = 'en-us'    TIME_ZONE = 'UTC'    USE_I18N = True    USE_L10N = True    USE_TZ = True      # Static files (CSS, JavaScript, Images)  # https://docs.djangoproject.com/en/1.9/howto/static-files/    STATIC_URL = '/static/'

the start of views.py

from django.http import JsonResponse, HttpResponse  import logging  import m3u8  import os  from VideoParser.parsers.CommonParsers import *  import urllib.parse  import hashlib  from datetime import datetime, timedelta, date  from django.views.decorators.csrf import csrf_exempt  from django.db import IntegrityError  from VideoParser.models import *  from importlib import import_module  # print('-------------views --------')  FILES_DIR = 'files'    # specialHostName2module = {'56': 'v56'}  logging.basicConfig(format='%(asctime)s %(message)s', datefmt='%m/%d %I:%M:%S %p', level=logging.ERROR, handlers=[logging.handlers.RotatingFileHandler(filename=os.path.join(FILES_DIR, 'LYYDownloaderServer.log'), maxBytes=1024 * 1024, backupCount=1)])  ...

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