code: def run_send_all(*args):
      '''
      Send email to all user.
      '''
      for user_rec in MUser.query_all():
          email_add = user_rec.user_email
          send_mail([email_add],
                    "{0}|{1}".format(SMTP_CFG['name'], email_cfg['title']),
                    email_cfg['content']f run_send_all(*args):
      '''
      Send email to all user.
      '''
      for user_rec in MUser.query_all():
          email_add = user_rec.user_email
          send_mail([email_add],
                    "{0}|{1}".format(SMTP_CFG['name'], email_cfg['title']),
                    email_cfg['content'])
docs: Send email to all user.