全文应该如下：
This is an automatically generated Delivery Status Notification.
THIS IS A WARNING MESSAGE ONLY.
YOU DO NOT NEED TO RESEND YOUR MESSAGE.
Delivery to the following recipients has been delayed.
这个是一个自动回复机器给你发送的.
大意就是这是一个警告的信件,你不需要回复你受到的信件,信件没有发送成功.
如有错误,请勿追究本人责任