The following addresses had permanent fatal errors

The original message was received at Wed, 16 Nov 2011 12:48:32 +0800
from dns.xxx.com.cn [xxxx]

   ----- The following addresses had permanent fatal errors -----
<>
    (reason: 554 Service unavailable; Client host [mail.xxx.com.cn] blocked using Barracuda Reputation; http://bbl.barracudacentral.com/q.cgi?ip=xxx)

   ----- Transcript of session follows -----
... while talking to mail1.oppo.com.:
>>> DATA
<<< 554 Service unavailable; Client host [mail.xxx.com.cn] blocked using Barracuda Reputation; http://bbl.barracudacentral.com/q.cgi?ip=xxxx

554 5.0.0 Service unavailable
451 4.4.1 reply: read error from mail1.oppo.com.

Reporting-MTA: dns; mail.xxxx.com.cn
Received-From-MTA: DNS; dns.xxx.com.cn
Arrival-Date: Wed, 16 Nov 2011 12:48:32 +0800

Final-Recipient: RFC822;
Action: failed
Status: 5.0.0
Remote-MTA: DNS; mail1.oppo.com
Diagnostic-Code: SMTP; 554 Service unavailable; Client host [mail.xxx.com.cn] blocked using Barracuda Reputation; http://bbl.barracudacentral.com/q.cgi?ip=xxxx

Last-Attempt-Date: Wed, 16 Nov 2011 12:48:34 +0800

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邮件服务器被列入了黑名单:

http://www.barracudacentral.org/lookups

在相关网站要求清除黑名单后，通信恢复正常