message['From'] = Header("xxxxx@163.com", 'utf-8')
message['To'] = Header("xxxxx@qq.com,xxxxx@qq.com", 'utf-8')
smtpObj.sendmail("xxxxx@163.com", ["xxxxx@qq.com","xxxxx@qq.com"], message.as_string())注意点：
From、To 要与 sendmail 中的前两个参数保持一致
To 多个邮箱用逗号隔开，sendmail 中的第二个参数要用 list
