Python 发邮件500语法错误

我遇到这问题的时候的源代码: try: smtp=smtplib.SMTP() smtp.connect('smtp.163.com',25) smtp.login('...','...') smtp.sendmail('xxx@163.com','xxx@163.com',MIMEText('老八秘制小汉堡').as_string()) smtp.close() except Exception as e: print(e) 然后 (220, b'163.com Anti-spam GT for Coremail System (163com[20141201])