主题: 收不到外网邮件,请问是为什么
一直用yum update进行系统升级,现在cetos5.4,结果收不到外网邮件了,退信提示:
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.
请问这是什么原因呀?