docs: def import_emails(self, archives_path, all, exclude_lists=None):
          """Get emails from the filesystem from the `archives_path`
          and store them into the database. If `all` is set to True all
          the filesystem storage will be imported otherwise the
          importation will resume from the last message previously
          imported. The lists set in `exclude_lists` won't be imported.
  
          """
  
          count = 0
          email_generator = self.get_emails(archives_path, all, exclude_lists)
          for mailinglist_name, msg, index in email_generator:
              try:
                  self.save_email(mailinglist_name, msg, index)
              except:
                  # This anti-pattern is needed to avoid the transations to
                  #   get stuck in case of errors.
                  transaction.rollback()
                  raise
  
              count += 1
              if count % 1000 == 0:
                  transaction.commit()
  
          transaction.commit()