old_contents: 
  import ujson
  
  from django.http import HttpRequest, HttpResponse
  from typing import Dict
  
  from zerver.decorator import internal_notify_view
  from zerver.lib.email_mirror import mirror_email_message
  from zerver.lib.request import has_request_variables, REQ
  from zerver.lib.response import json_error, json_success
  from zerver.lib.validator import check_dict, check_string
  
  
  @internal_notify_view(False)
  @has_request_variables
  def email_mirror_message(request, data=REQ(validator=check_dict([
          ('recipient', check_string),
          ('msg_text', check_string),
  ]))):
      # type: (HttpRequest, Dict[str, str]) -> HttpResponse
      result = mirror_email_message(ujson.loads(request.POST['data']))
      if result["status"] == "error":
          return json_error(result['msg'])
      return json_success()
  
new_contents: 
  import ujson
  
  from django.http import HttpRequest, HttpResponse
  from typing import Dict
  
  from zerver.decorator import internal_notify_view
  from zerver.lib.email_mirror import mirror_email_message
  from zerver.lib.request import has_request_variables, REQ
  from zerver.lib.response import json_error, json_success
  from zerver.lib.validator import check_dict, check_string
  
  
  @internal_notify_view(False)
  @has_request_variables
  def email_mirror_message(request: HttpRequest,
                           data: Dict[str, str]=REQ(validator=check_dict([
                               ('recipient', check_string),
                               ('msg_text', check_string)]))) -> HttpResponse:
      result = mirror_email_message(ujson.loads(request.POST['data']))
      if result["status"] == "error":
          return json_error(result['msg'])
      return json_success()
  
subject: Use Python 3 type syntax in zerver/views/email_mirror.py.