阿里云邮件推送包，适配 tornado 框架，异步费阻塞 API 调用
pip install tornado-directmail-aliyun
from tornado_directmail.client import AliMail
access_id = 'xxxxxx'
access_secret = 'xxxxxx'
from_address = '[email protected]'
from_alias = '小白'
ali_client = AliMail(access_id, access_secret, from_address, from_alias, region="hangzhou") # 可选的 region: hangzhou | singapore | sydney
resp = yield ali_client.send('[email protected]', '主题', '内容', is_html=False) # 默认为纯文本内容
print(resp)