我寄了一封信:然後收到以下訊息,是什麼意思啊?

我寄了一封信
然後收到以下訊息
是什麼意思啊
對方沒有收到我的信嗎??

謝謝

Delivery Status Notification (Delay)


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.