553 You are not authorized to send mail,authentication is required

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553 You are not authorized to send mail,authentication is required
553 You are not authorized to send mail,authentication is required

553 You are not authorized to send mail,authentication is required
翻译：553 你没有得到发送邮件的授权,（发送邮件）需要身份验证.553 你没有得到发送邮件的授权,（发送邮件）需要身份验证.你是使用Microsoft

我猜，可能是你的发件人用户名和msg.setFrom的值不一样，如果不以样，除了sina的SMTP以外，其他服务器都会包这个错误，要是说的不对的话，把完整的错误信息给我看看

You are not wrong you are not you are not alone You are not also you are not you are not alway You are not you are not alone You Are Not you are not god You are not alone , You are not enough You are not prepared! You Are Not you are not me! you are not alone You Are Not You Are Not