code: def get_emails(self, mailinglist_dir, all, exclude_lists):
          
          self.log("Getting emails dumps from: %s" % mailinglist_dir)
  
          # Get the list of directories ending with .mbox
          mailing_lists_mboxes = (mbox for mbox in os.listdir(mailinglist_dir)
                                  if mbox.endswith('.mbox'))
  
          # Get messages from each mbox
          for mbox in mailing_lists_mboxes:
              mbox_path = os.path.join(mailinglist_dir, mbox, mbox)
              mailinglist_name = mbox.split('.')[0]
  
              # Check if the mailinglist is set not to be imported
              if exclude_lists and mailinglist_name in exclude_lists:
                  continue
  
              # Find the index of the last imported message
              if all:
                  n_msgs = 0
              else:
                  try:
                      mailinglist = MailingList.objects.get(
                          name=mailinglist_name
                      )
                      n_msgs = mailinglist.last_imported_index
                  except MailingList.DoesNotExist:
                      n_msgs = 0
  
              for index, msg in self.parse_emails(mbox_path, n_msgs):
                  yield mailinglist_name, msg, index
docs: Generator function that get the emails from each mailing
          list dump dirctory. If `all` is set to True all the emails in the
          mbox will be imported if not it will just resume from the last
          message previously imported. The lists set in `exclude_lists`
          won't be imported.
  
          Yield: A tuple in the form: (mailing list name, email message).