[求助] 請高手幫忙!

magman

請問網主, 以下的錯誤是 sender 方面的 server 或是 receipant 的 server error?<br>
是那裡出錯?<br>
<br>
The original message was received at Tue, 28 Feb 2006 13:25:23 +0800<br>
from nobody@localhost<br>
<br>----- The following addresses had permanent fatal errors -----<br>
xxxx@xxxxgroup.com<br>(reason: 554 5.7.1 This message has been blocked because the return email domain is invalid.)<br>
<br>----- Transcript of session follows -----<br>
... while talking to mail.xxxxgroup.com.:<br>
>>> DATA<br>
<<< 554 5.7.1 This message has been blocked because the return email domain is invalid.<br>
554 5.0.0 Service unavailable<br>
<br>