def check_mailing_list(sig_info, errors):
    """
    Check mailing_list
    :param sig_info: content of sig-info.yaml
    :param errors: errors count
    :return: errors
    """
    if 'mailing_list' not in sig_info.keys():
        print('ERROR! mailing_list is a required field')
        errors += 1
    else:
        print('Check mailing_list: PASS')
    return errors