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.

• 最近发往美国的邮件都被退回了,只要是带附件的邮件就会被退回来，文本的邮件可以发送,以前是好的，最近才发生，不知道怎么回事。