old_contents: from mailu import limiter
  
  import socket
  import flask
  
  
  internal = flask.Blueprint('internal', __name__)
  
  
  @limiter.request_filter
  def whitelist_webmail():
      try:
          return flask.request.headers["Client-Ip"] ==\
              socket.gethostbyname("webmail")
      except:
          return False
  
  
  from mailu.internal import views
  
new_contents: from flask_limiter import RateLimitExceeded
  
  from mailu import limiter
  
  import socket
  import flask
  
  
  internal = flask.Blueprint('internal', __name__)
  
  @internal.app_errorhandler(RateLimitExceeded)
  def rate_limit_handler(e):
      response = flask.Response()
      response.headers['Auth-Status'] = 'Authentication rate limit from one source exceeded'
      response.headers['Auth-Error-Code'] = '451 4.3.2'
      if int(flask.request.headers['Auth-Login-Attempt']) < 10:
          response.headers['Auth-Wait'] = '3'
      return response
  
  @limiter.request_filter
  def whitelist_webmail():
      try:
          return flask.request.headers["Client-Ip"] ==\
              socket.gethostbyname("webmail")
      except:
          return False
  
  
  from mailu.internal import views
  
subject: Return correct status codes from auth rate limiter failure.