[Mail] hotmail、sina给我们邮件发信退信，报rfc822错

[weixin_38077401]

新浪给我们的邮件系统发信，退信内容为：

This is the SINAMAIL program at host smtp.sina.com.cn.

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 <postmaster>

If you do so, please include this problem report. You can
delete your own text from the attached returned message.

                        The SINAMAIL program

<[e-mail]>: connect to mail.cqupt.edu.cn[219.153.XX.XX]: Operation
    timed out

Reporting-MTA: dns; smtp.sina.com.cn
X-SINAMAIL-Queue-ID: C9A725DCD96
X-SINAMAIL-Sender: rfc822; [e-mail]
Arrival-Date: Wed, 29 Aug 2007 14:27:20 +0800 (CST)

Final-Recipient: rfc822; [e-mail]
Action: failed
Status: 4.0.0
Diagnostic-Code: X-SINAMAIL; connect to mail.cqupt.edu.cn[219.153.xx.xx]:
    Operation timed out



hotmail给我们发信的退信为：


Reporting-MTA: dns;bay0-omc2-s21.bay0.hotmail.com
Received-From-MTA: dns;BAY122-W4
Arrival-Date: Wed, 29 Aug 2007 02:36:56 -0700

Final-Recipient: rfc822;[e-mail]
Action: failed
Status: 5.5.0
Diagnostic-Code: smtp;554 Transaction Failed (650058837:169:-2147467259)


两种退信都是说的rfc822 。不知道我们的邮件系统为什么会造成这种原因的退信，现在从这两个地方发不过来信！