我的126邮箱最近老是发不出信。我设了已读回执，可回过来的是以Undelivered Mail Returned to Sender名的邮件，其内容是This is the Postfix program at host 263xmail.com.
I'm sorry to have to inform you that your message could not
be delivered to one or more recipients. It's attached below.
For further assistance, please send mail to
If you do so, please include this problem report. You can
delete your own text from the attached returned message.
The Postfix program
--- Delivery report unavailable ---
。请问这是为什么啊？各位老大请帮帮我啊？我发不出去单位可是要罚钱的啊。
老大们有什么高招啊？快帮帮我吧。
