async def mail_send(ns={}):
    user_id = ns['user_id']
    ns_customer = {
        'id': uuid(),
        'senderid': 'inner',
        'receiverid': user_id,
        'msgtitle': '系统新消息通知',
        'msgtype': '欠费通知',
        'msgtext': '尊敬的用户, 您购买的产品 %s 已欠费, 请及时续费以免影响正常使用。' % 'BCC',
    }
    db = DBPools()
    async with db.sqlorContext('kboss') as sor:
        await sor.C('message', ns_customer)

ret = await mail_send(params_kw)
return ret